Hi,
I'm developing a site using Bartik theme.
My logo's size is 1290x550 px so it should cover all the header area and stay behind the main menu.
By simply uploading a new logo it looks like this:
http://img703.imageshack.us/img703/9841/bartik1.png

Is there a way to make it look a little bit like this via CSS?
http://imageshack.us/a/img687/8485/bartik2.jpg

Thank you in advance.

Comments

You could try something like

/* Position the logo absolute and to the left to centre it */
#logo {
  position: absolute:
  top: 0;
  left: -150px;
  float: none;
}
/* Make sure the header area has the right height to fit the logo */
#header {
  height: 520px;
}

Don't forget you need to think how it will look for people who have screens wider than 1290 px

Cheers

Thanks for the suggestion. Unfortunately I can't find the right lines to edit (I can only understand CSS, but editing is quite complicated for me).
My site now looks like this. The main menu is now behind the logo and everything looks quite messy.

Here's my CSS file:

/* ---------- Overall Specifications ---------- */
body {
  line-height: 1.5;
  font-size: 87.5%;
  word-wrap: break-word;
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
}
a:link,
a:visited {
  text-decoration: none;
}
a:hover,
a:active,
a:focus {
  text-decoration: underline;
}
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 1.0em 0 0.5em;
  font-weight: inherit;
}
h1 {
  font-size: 1.357em;
  color: #000;
}
h2 {
  font-size: 1.143em;
}
p {
  margin: 0 0 1.2em;
}
del {
  text-decoration: line-through;
}
tr.odd {
  background-color: #dddddd;
}
img {
  outline: 0;
}
code,
pre,
kbd,
samp,
var {
  padding: 0 0.4em;
  font-size: 0.77em;
  font-family: Menlo, Consolas, "Andale Mono", "Lucida Console", "Nimbus Mono L", "DejaVu Sans Mono", monospace, "Courier New";
}
code {
  background-color: #f2f2f2;
  background-color: rgba(40, 40, 0, 0.06);
}
pre code,
pre kbd,
pre samp,
pre var,
kbd kbd,
kbd samp,
code var {
  font-size: 100%;
  background-color: transparent;
}
pre code,
pre samp,
pre var {
  padding: 0;
}
.description code {
  font-size: 1em;
}
kbd {
  background-color: #f2f2f2;
  border: 1px outset #575757;
  margin: 0 3px;
  color: #666;
  display: inline-block;
  padding: 0 6px;
  -khtml-border-radius: 5px;
  -moz-border-radius: 5px;
  -webkit-border-radius: 5px;
  border-radius: 5px;
}
pre {
  background-color: #f2f2f2;
  background-color: rgba(40, 40, 0, 0.06);
  margin: 10px 0;
  overflow: hidden;
  padding: 15px;
  white-space: pre-wrap;
}
/* ------------------ Fonts ------------------ */
body,
#site-slogan,
.ui-widget,
.comment-form label {
  font-family: Georgia, "Times New Roman", Times, serif;
}
#header,
#footer-wrapper,
#skip-link,
ul.contextual-links,
ul.links,
ul.primary,
.item-list .pager,
div.field-type-taxonomy-term-reference,
div.messages,
div.meta,
p.comment-time,
table,
.breadcrumb {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
}
input,
textarea,
select,
a.button {
  font-family: "Lucida Grande", "Lucida Sans Unicode", Verdana, sans-serif;
}
/* ------------------ Reset Styles ------------------ */
caption {
  text-align: left; /* LTR */
  font-weight: normal;
}
blockquote {
  background: #f7f7f7;
  border-left: 1px solid #bbb;
  font-style: italic;
  margin: 1.5em 10px;
  padding: 0.5em 10px;
}
blockquote:before {
  color: #bbb;
  content: "\201C";
  font-size: 3em;
  line-height: 0.1em;
  margin-right: 0.2em;
  vertical-align: -.4em;
}
blockquote:after {
  color: #bbb;
  content: "\201D";
  font-size: 3em;
  line-height: 0.1em;
  vertical-align: -.45em;
}
blockquote > p:first-child {
  display: inline;
}
a.feed-icon {
  display: inline-block;
  padding: 15px 0 0 0;
}
/* ------------------ Table Styles ------------------ */
table {
  border: 0;
  border-spacing: 0;
  font-size: 0.857em;
  margin: 10px 0;
  width: 100%;
}
table table {
  font-size: 1em;
}
#footer-wrapper table {
  font-size: 1em;
}
table tr th {
  background: #757575;
  background: rgba(0, 0, 0, 0.51);
  border-bottom-style: none;
}
table tr th,
table tr th a,
table tr th a:hover {
  color: #FFF;
  font-weight: bold;
}
table tbody tr th {
  vertical-align: top;
}
tr td,
tr th {
  padding: 4px 9px;
  border: 1px solid #fff;
  text-align: left; /* LTR */
}
#footer-wrapper tr td,
#footer-wrapper tr th {
  border-color: #555;
  border-color: rgba(255, 255, 255, 0.18);
}
tr.odd {
  background: #e4e4e4;
  background: rgba(0, 0, 0, 0.105);
}
tr,
tr.even {
  background: #efefef;
  background: rgba(0, 0, 0, 0.063);
}
table ul.links {
  margin: 0;
  padding: 0;
  font-size: 1em;
}
table ul.links li {
  padding: 0 1em 0 0;
}
/* ------------------ List Styles ------------------ */
.block ol,
.block ul {
  margin: 0;
  padding: 0 0 0.25em 1em; /* LTR */
}
.contextual-links-wrapper {
  font-size: small !important;
}
ul.contextual-links {
  font-size: 0.923em;
}
.contextual-links-wrapper a {
  text-shadow: 0 0 0 !important;
}
.item-list .pager {
  font-size: 0.929em;
}
ul.menu li {
  margin: 0;
}
.region-content ul,
.region-content ol {
  margin: 1em 0;
  padding: 0 0 0.25em 2.5em; /* LTR */
}
.item-list ul li {
  margin: 0;
  padding: 0.2em 0.5em 0 0; /* LTR */
}
ul.tips {
  padding: 0 0 0 1.25em; /* LTR */
}
/* ------------------ Header ------------------ */
/* Make sure the header area has the right height to fit the logo */
#header {
  height: 520px;
}
#skip-link {
  left: 50%;
  margin-left: -5.25em;
  margin-top: 0;
  position: absolute;
  width: auto;
  z-index: 50;
}
#skip-link a,
#skip-link a:link,
#skip-link a:visited {
  background: #444;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  display: block;
  font-size: 0.94em;
  line-height: 1.7;
  padding: 1px 10px 2px 10px;
  text-decoration: none;
  -khtml-border-radius: 0 0 10px 10px;
  -moz-border-radius: 0 0 10px 10px;
  -webkit-border-top-left-radius: 0;
  -webkit-border-top-right-radius: 0;
  -webkit-border-bottom-left-radius: 10px;
  -webkit-border-bottom-right-radius: 10px;
  border-radius: 0 0 10px 10px;
}
#skip-link a:hover,
#skip-link a:active,
#skip-link a:focus {
  outline: 0;
}
#logo {
  position: absolute:
  top: 0;
  left: -150px;
  float: none;
}
#name-and-slogan {
  float: left; /* LTR */
  padding-top: 34px;
  margin: 0 0 30px 15px; /* LTR */
}
#site-name {
  font-size: 1.821em;
  color: #686868;
  line-height: 1;
}
h1#site-name {
  margin: 0;
}
#site-name a {
  font-weight: normal;
}
#site-slogan {
  font-size: 0.929em;
  margin-top: 7px;
  word-spacing: 0.1em;
  font-style: italic;
}
/* Region header blocks. */
.region-header .block {
  font-size: 0.857em;
  float: left; /* LTR */
  margin: 0 10px;
  padding: 0;
}
.region-header .block .content {
  margin: 0;
  padding: 0;
}
.region-header .block ul {
  margin: 0;
  padding: 0;
}
.region-header .block li {
  list-style: none;
  list-style-image: none;
  padding: 0;
}
.region-header .form-text {
  background: #fefefe;
  background: rgba(255, 255, 255, 0.7);
  border-color: #ccc;
  border-color: rgba(255, 255, 255, 0.3);
  margin-right: 2px; /* LTR */
  width: 120px;
}
.region-header .form-text:hover,
.region-header .form-text:focus,
.region-header .form-text:active {
  background: #fff;
  background: rgba(255, 255, 255, 0.8);
}
.region-header .form-required {
  color: #eee;
  color: rgba(255, 255, 255, 0.7);
}
/* Region header block menus. */
.region-header .block-menu {
  border: 1px solid;
  border-color: #eee;
  border-color: rgba(255, 255, 255, 0.2);
  padding: 0;
  width: 208px;
}
.region-header .block-menu li a {
  display: block;
  border-bottom: 1px solid;
  border-bottom-color: #eee;
  border-bottom-color: rgba(255, 255, 255, 0.2);
  padding: 3px 7px;
}
.region-header .block-menu li a:hover,
.region-header .block-menu li a:focus,
.region-header .block-menu li a:active {
  text-decoration: none;
  background: rgba(255, 255, 255, 0.15);
}
.region-header .block-menu li.last a {
  border-bottom: 0;
}
/* User Login block in the header region */
.region-header #block-user-login {
  width: auto;
}
.region-header #block-user-login .content {
  margin-top: 2px;
}
.region-header #block-user-login .form-item {
  float: left; /* LTR */
  margin: 0;
  padding: 0;
}
.region-header #block-user-login div.item-list,
.region-header #block-user-login div.description {
  font-size: 0.916em;
  margin: 0;
}
.region-header #block-user-login div.item-list {
  clear: both;
}
.region-header #block-user-login div.description {
  display: inline;
}
.region-header #block-user-login .item-list ul {
  padding: 0;
  line-height: 1;
}
.region-header #block-user-login .item-list li {
  list-style: none;
  float: left; /* LTR */
  padding: 3px 0 1px;
}
.region-header #block-user-login .item-list li.last {
  padding-left: 0.5em; /* LTR */
}
.region-header #block-user-login ul.openid-links li.last {
  padding-left: 0; /* LTR */
}
.region-header #user-login-form li.openid-link a,
.region-header #user-login li.openid-link a {
  padding-left: 20px; /* LTR */
}
.region-header #block-user-login .form-actions {
  margin: 4px 0 0;
  padding: 0;
  clear: both;
}
.region-header #block-user-login input.form-submit {
  border: 1px solid;
  border-color: #ccc;
  border-color: rgba(255, 255, 255, 0.5);
  background: #eee;
  background: rgba(255, 255, 255, 0.7);
  margin: 4px 0;
  padding: 3px 8px;
}
.region-header #block-user-login input.form-submit:hover,
.region-header #block-user-login input.form-submit:focus {
  background: #fff;
  background: rgba(255, 255, 255, 0.9);
}
/* Search block in region header. */
.region-header #block-search-form {
  width: 208px;
}
.region-header #block-search-form .form-text {
  width: 154px;
}
/* Language switcher block in region header. */
.region-header .block-locale ul li {
  display: inline;
  padding: 0 0.5em;
}
/* --------------- Main Menu ------------ */
#main-menu {
  clear: both;
}
#main-menu-links {
  font-size: 0.929em;
  margin: 0;
  padding: 0 15px;
}
#main-menu-links li {
  float: left; /* LTR */
  list-style: none;
  padding: 0 1px;
  margin: 0 1px;
}
#main-menu-links a {
  color: #333;
  background: #ccc;
  background: rgba(255, 255, 255, 0.7);
  float: left; /* LTR */
  height: 2.4em;
  line-height: 2.4em;
  padding: 0 0.8em;
  text-decoration: none;
  text-shadow: 0 1px #eee;
  -khtml-border-radius-topleft: 8px;
  -khtml-border-radius-topright: 8px;
  -moz-border-radius-topleft: 8px;
  -moz-border-radius-topright: 8px;
  -webkit-border-top-left-radius: 8px;
  -webkit-border-top-right-radius: 8px;
  border-top-left-radius: 8px;
  border-top-right-radius: 8px;
}
#main-menu-links a:hover,
#main-menu-links a:focus {
  background: #f6f6f2;
  background: rgba(255, 255, 255, 0.95);
}
#main-menu-links a:active {
  background: #b3b3b3;
  background: rgba(255, 255, 255, 1);
}
#main-menu-links li a.active {
  border-bottom: none;
}
.featured #main-menu-links li a:active,
.featured #main-menu-links li a.active {
  background: #f0f0f0;
  background: rgba(240, 240, 240, 1.0);
}
/* --------------- Secondary Menu ------------ */
#secondary-menu-links {
  float: right; /* LTR */
  font-size: 0.929em;
  margin: 10px 10px 0;
}
#secondary-menu-links a:hover,
#secondary-menu-links a:focus {
  text-decoration: underline;
}
/* ------------------- Main ------------------- */
#main {
  margin-top: 20px;
  margin-bottom: 40px;
}
/* ----------------- Featured ----------------- */
#featured {
  text-align: center;
  font-size: 1.643em;
  font-weight: normal;
  line-height: 1.4;
  padding: 20px 0 45px;
  margin: 0;
  background: #f0f0f0;
  background: rgba(30, 50, 10, 0.08);
  border-bottom: 1px solid #e7e7e7;
  text-shadow: 1px 1px #fff;
}
#featured h2 {
  font-size: 1.174em;
  line-height: 1;
}
#featured p {
  margin: 0;
  padding: 0;
}
/* --------------- Highlighted ---------------- */
#highlighted {
  border-bottom: 1px solid #d3d7d9;
  font-size: 120%;
}
/* ------------------- Help ------------------- */
.region-help {
  border: 1px solid #d3d7d9;
  padding: 0 1.5em;
  margin-bottom: 30px;
}
/* ----------------- Content ------------------ */
.content {
  margin-top: 10px;
}
h1#page-title {
  font-size: 2em;
  line-height: 1;
}
#content h2 {
  margin-bottom: 2px;
  font-size: 1.429em;
  line-height: 1.4;
}
.node .content {
  font-size: 1.071em;
}
.node-teaser .content {
  font-size: 1em;
}
.node-teaser h2 {
  margin-top: 0;
  padding-top: 0.5em;
}
.node-teaser h2 a {
  color: #181818;
}
.node-teaser {
  border-bottom: 1px solid #d3d7d9;
  margin-bottom: 30px;
  padding-bottom: 15px;
}
.node-sticky {
  background: #f9f9f9;
  background: rgba(0, 0, 0, 0.024);
  border: 1px solid #d3d7d9;
  padding: 0 15px 15px;
}
.node-full {
  background: none;
  border: none;
  padding: 0;
}
.node-teaser .content {
  clear: none;
  line-height: 1.6;
}
.meta {
  font-size: 0.857em;
  color: #68696b;
  margin-bottom: -5px;
}
.submitted .user-picture img {
  float: left; /* LTR */
  height: 20px;
  margin: 1px 5px 0 0; /* LTR */
}
.field-type-taxonomy-term-reference {
  margin: 0 0 1.2em;
}
.field-type-taxonomy-term-reference .field-label {
  font-weight: normal;
  margin: 0;
  padding-right: 5px; /* LTR */
}
.field-type-taxonomy-term-reference .field-label,
.field-type-taxonomy-term-reference ul.links {
  font-size: 0.8em;
}
.node-teaser .field-type-taxonomy-term-reference .field-label,
.node-teaser .field-type-taxonomy-term-reference ul.links {
  font-size: 0.821em;
}
.field-type-taxonomy-term-reference ul.links {
  padding: 0;
  margin: 0;
  list-style: none;
}
.field-type-taxonomy-term-reference ul.links li {
  float: left; /* LTR */
  padding: 0 1em 0 0; /* LTR */
  white-space: nowrap;
}
.link-wrapper {
  text-align: right;
}
.field-type-image img,
.user-picture img {
  margin: 0 0 1em;
}
ul.links {
  color: #68696b;
  font-size: 0.821em;
}
.node-unpublished {
  margin: -20px -15px 0;
  padding: 20px 15px 0;
}
.node-unpublished .comment-text .comment-arrow {
  border-left: 1px solid #fff4f4;
  border-right: 1px solid #fff4f4;
}
/* ----------------- Comments ----------------- */
.comment h2.title {
  margin-bottom: 1em;
}
.comment div.user-picture img {
  margin-left: 0; /* LTR */
}
.comment {
  margin-bottom: 20px;
  display: table;
  vertical-align: top;
}
.comment .attribution {
  display: table-cell;
  padding: 0 30px 0 0; /* LTR */
  vertical-align: top;
  overflow: hidden;
}
.comment .attribution img {
  margin: 0;
  border: 1px solid #d3d7d9;
}
.comment .attribution .username {
  white-space: nowrap;
}
.comment .submitted p {
  margin: 4px 0;
  font-size: 1.071em;
  line-height: 1.2;
}
.comment .submitted .comment-time {
  font-size: 0.786em;
  color: #68696b;
}
.comment .submitted .comment-permalink {
  font-size: 0.786em;
  text-transform: lowercase;
}
.comment .content {
  font-size: 0.929em;
  line-height: 1.6;
}
.comment .comment-arrow {
  background: url(../images/comment-arrow.gif) no-repeat 0 center transparent; /* LTR */
  border-left: 1px solid;
  border-right: 1px solid;
  height: 40px;
  margin-left: -47px; /* LTR */
  margin-top: 10px;
  position: absolute;
  width: 20px;
}
.comment .comment-text {
  padding: 10px 25px;
  border: 1px solid #d3d7d9;
  display: table-cell;
  vertical-align: top;
  position: relative;
  width: 100%;
}
.comment .indented {
  margin-left: 40px; /* LTR */
}
.comment ul.links {
  padding: 0 0 0.25em 0;
}
.comment ul.links li {
  padding: 0 0.5em 0 0; /* LTR */
}
.comment-unpublished {
  margin-right: 5px; /* LTR */
  padding: 5px 2px 5px 5px; /* LTR */
}
.comment-unpublished .comment-text .comment-arrow {
  border-left: 1px solid #fff4f4;
  border-right: 1px solid #fff4f4;
}
/* ------------------ Sidebar ----------------- */
.sidebar .section {
  padding-top: 10px;
}
.sidebar .block {
  border: 1px solid;
  padding: 15px 20px;
  margin: 0 0 20px;
}
.sidebar h2 {
  margin: 0 0 0.5em;
  border-bottom: 1px solid #d6d6d6;
  padding-bottom: 5px;
  text-shadow: 0 1px 0 #fff;
  font-size: 1.071em;
  line-height: 1.2;
}
.sidebar .block .content {
  font-size: 0.914em;
  line-height: 1.4;
}
.sidebar tbody {
  border: none;
}
.sidebar tr.even,
.sidebar tr.odd {
  background: none;
  border-bottom: 1px solid #d6d6d6;
}
/* ----------------- Triptych ----------------- */
#triptych-wrapper {
  background-color: #f0f0f0;
  background: rgba(30, 50, 10, 0.08);
  border-top: 1px solid #e7e7e7;
}
#triptych h2 {
  color: #000;
  font-size: 1.714em;
  margin-bottom: 0.8em;
  text-shadow: 0 1px 0 #fff;
  text-align: center;
  line-height: 1;
}
#triptych .block {
  margin-bottom: 2em;
  padding-bottom: 2em;
  border-bottom: 1px solid #dfdfdf;
  line-height: 1.3;
}
#triptych .block.last {
  border-bottom: none;
}
#triptych .block ul li,
#triptych .block ol li {
  list-style: none;
}
#triptych .block ul,
#triptych .block ol {
  padding-left: 0;
}
#triptych #block-user-login .form-text {
  width: 185px;
}
#triptych #block-user-online p {
  margin-bottom: 0;
}
#triptych #block-node-syndicate h2 {
  overflow: hidden;
  width: 0;
  height: 0;
}
#triptych-last #block-node-syndicate {
  text-align: right;
}
#triptych #block-search-form .form-type-textfield input {
  width: 185px;
}
#triptych-middle #block-system-powered-by {
  text-align: center;
}
#triptych-last #block-system-powered-by {
  text-align: right;
}
/* ------------------ Footer ------------------ */
#footer-wrapper {
  color: #c0c0c0;
  color: rgba(255, 255, 255, 0.65);
  font-size: 0.857em;
}
#footer-wrapper a {
  color: #fcfcfc;
  color: rgba(255, 255, 255, 0.8);
}
#footer-wrapper a:hover,
#footer-wrapper a:focus {
  color: #fefefe;
  color: rgba(255, 255, 255, 0.95);
  text-decoration: underline;
}
#footer-wrapper .block {
  margin: 20px 0;
  border: 1px solid #444;
  border-color: rgba(255, 255, 255, 0.1);
  padding: 10px;
}
#footer-columns .block-menu,
#footer .block {
  margin: 0;
  padding: 0;
  border: none;
}
#footer .block {
  margin: 0.5em 0;
}
#footer .block .content {
  padding: 0.5em 0;
  margin-top: 0;
}
#footer .block h2 {
  margin: 0;
}
#footer-columns h2 {
  border-bottom: 1px solid #555;
  border-color: rgba(255, 255, 255, 0.15);
  font-size: 1em;
  margin-bottom: 0;
  padding-bottom: 3px;
  text-transform: uppercase;
}
#footer-columns .content {
  margin-top: 0;
}
#footer-columns p {
  margin-top: 1em;
}
#footer-columns .content ul {
  list-style: none;
  padding-left: 0; /* LTR */
  margin-left: 0;
}
#footer-columns .content li {
  list-style: none;
  margin: 0;
  padding: 0;
}
#footer-columns .content li a {
  display: block;
  border-bottom: 1px solid #555;
  border-color: rgba(255, 255, 255, 0.15);
  line-height: 1.2;
  padding: 0.8em 2px 0.8em 20px; /* LTR */
  text-indent: -15px;
}
#footer-columns .content li a:hover,
#footer-columns .content li a:focus {
  background-color: #1f1f21;
  background-color: rgba(255, 255, 255, 0.05);
  text-decoration: none;
}
#footer {
  letter-spacing: 0.2px;
  margin-top: 30px;
  border-top: 1px solid #555;
  border-color: rgba(255, 255, 255, 0.15);
}
#footer .region {
  margin-top: 20px;
}
#footer .block {
  clear: both;
}
#footer ul,
#footer li {
  list-style: none;
  margin: 0;
  padding: 0;
}
#footer li a {
  float: left; /* LTR */
  padding: 0 12px;
  display: block;
  border-right: 1px solid #555; /* LTR */
  border-color: rgba(255, 255, 255, 0.15);
}
#footer li.first a {
  padding-left: 0; /* LTR */
}
#footer li.last a {
  padding-right: 0; /* LTR */
  border-right: none; /* LTR */
}
#footer-wrapper tr.odd {
  background-color: transparent;
}
#footer-wrapper tr.even {
  background-color: #2c2c2c;
  background-color: rgba(0, 0, 0, 0.15);
}
/* --------------- System Tabs  --------------- */
.tabs {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  margin-bottom: 20px;
}
.tabs ul.primary {
  padding: 0 3px;
  margin: 0;
  overflow: hidden;
  border: none;
  background: transparent url(../images/tabs-border.png) repeat-x left bottom;
}
.tabs ul.primary li {
  display: block;
  float: left; /* LTR */
  vertical-align: bottom;
  margin: 0 5px 0 0; /* LTR */
}
.tabs ul.primary li.active a {
  border-bottom: 1px solid #ffffff;
}
.tabs ul.primary li a {
  color: #000;
  background-color: #ededed;
  height: 1.8em;
  line-height: 1.9;
  display: block;
  font-size: 0.929em;
  float: left; /* not LTR */
  padding: 0 10px 3px;
  margin: 0;
  text-shadow: 0 1px 0 #fff;
  -khtml-border-radius-topleft: 6px;
  -moz-border-radius-topleft: 6px;
  -webkit-border-top-left-radius: 6px;
  border-top-left-radius: 6px;
  -khtml-border-radius-topright: 6px;
  -moz-border-radius-topright: 6px;
  -webkit-border-top-right-radius: 6px;
  border-top-right-radius: 6px;
}
.tabs ul.primary li.active a {
  background-color: #ffffff;
}
.tabs ul.secondary {
  border-bottom: none;
  padding: 0.5em 0;
}
.tabs ul.secondary li {
  display: block;
  float: left; /* LTR */
}
.tabs ul.secondary li:last-child {
  border-right: none; /* LTR */
}
.tabs ul.secondary li:first-child {
  padding-left: 0; /* LTR */
}
.tabs ul.secondary li a {
  padding: 0.25em 0.5em;
}
.tabs ul.secondary li a.active {
  background: #f2f2f2;
  border-bottom: none;
  -moz-border-radius: 5px;
  -webkit-border-radius: 5px;
  -khtml-border-radius: 5px;
  border-radius: 5px;
}
ul.action-links {
  list-style: none;
  margin: 5px;
  padding: 0.5em 1em;
}
ul.action-links li {
  display: inline-block;
  margin-left: 10px;
}
ul.action-links li a {
  padding-left: 15px;
  background: url(../images/add.png) no-repeat left center;
  margin: 0 10px 0 0;
}
/* ---------------- Messages  ----------------- */
#messages {
  padding: 20px 0 5px;
  margin: 0 auto;
}
.featured #messages {
  background: #f0f0f0;
  background: rgba(30, 50, 10, 0.08);
}
div.messages {
  margin: 8px 15px;
}
/* -------------- Breadcrumbs   -------------- */
.breadcrumb {
  font-size: 0.929em;
}
/* -------------- User Profile   -------------- */
.profile .user-picture {
  float: none;
}
/* -------------- Password Meter  ------------- */
.confirm-parent,
.password-parent {
  width: 34em;
}
.password-parent,
div.form-item div.password-suggestions {
  position: relative;
}
.password-strength-text,
.password-strength-title,
div.password-confirm {
  font-size: 0.82em;
}
.password-strength-text {
  margin-top: 0.2em;
}
div.password-confirm {
  margin-top: 2.2em;
  width: 20.73em;
}
/* ---------------- Buttons    ---------------- */
input.form-submit,
a.button {
  background: #fff url(../images/buttons.png) 0 0 repeat-x;
  border: 1px solid #e4e4e4;
  border-bottom: 1px solid #b4b4b4;
  border-left-color: #d2d2d2;
  border-right-color: #d2d2d2;
  color: #3a3a3a;
  cursor: pointer;
  font-size: 0.929em;
  font-weight: normal;
  text-align: center;
  margin-bottom: 1em;
  margin-right: 0.6em; /* LTR */
  padding: 4px 17px;
  -khtml-border-radius: 15px;
  -moz-border-radius: 20px;
  -webkit-border-radius: 15px;
  border-radius: 15px;
}
a.button:link,
a.button:visited,
a.button:hover,
a.button:focus,
a.button:active {
  text-decoration: none;
  color: #5a5a5a;
}
/* -------------- Form Elements   ------------- */
fieldset {
  background: #ffffff;
  border: 1px solid #cccccc;
  margin-top: 10px;
  margin-bottom: 32px;
  padding: 0 0 10px;
  position: relative;
  top: 12px; /* Offsets the negative margin of legends */
  -khtml-border-radius: 4px;
  -moz-border-radius: 4px;
  -webkit-border-radius: 4px;
  border-radius: 4px;
}
.fieldset-wrapper {
  margin-top: 25px;
}
.node-form .vertical-tabs .fieldset-wrapper {
  margin-top: 0;
}
.filter-wrapper {
  top: 0;
  padding: 1em 0 0.2em;
  -khtml-border-radius-topright: 0;
  -khtml-border-radius-topleft: 0;
  -moz-border-radius-topright: 0;
  -moz-border-radius-topleft: 0;
  -webkit-border-top-left-radius: 0;
  -webkit-border-top-right-radius: 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}
.filter-help a {
  font-size: 0.857em;
  padding: 2px 20px 0;
}
.filter-wrapper .form-item label {
  margin-right: 10px;
}
.filter-wrapper .form-item {
  padding: 0 0 0.5em 0.5em;
}
.filter-guidelines {
  padding: 0 1.5em 0 0.5em;
}
fieldset.collapsed {
  background: transparent;
  -khtml-border-radius: 0;
  -moz-border-radius: 0;
  -webkit-border-radius: 0;
  border-radius: 0;
}
fieldset legend {
  background: #dbdbdb;
  border: 1px solid #ccc;
  border-bottom: none;
  color: #3b3b3b;
  display: block;
  height: 2em;
  left: -1px; /* LTR */
  font-family: "Lucida Grande", "Lucida Sans Unicode", Verdana, sans-serif;
  line-height: 2;
  padding: 0;
  position: absolute;
  text-indent: 10px;
  text-shadow: 0 1px 0 #fff;
  top: -12px;
  width: 100%;
  -khtml-border-radius-topleft: 4px;
  -moz-border-radius-topleft: 4px;
  -webkit-border-top-left-radius: 4px;
  border-top-left-radius: 4px;
  -khtml-border-radius-topright: 4px;
  -moz-border-radius-topright: 4px;
  -webkit-border-top-right-radius: 4px;
  border-top-right-radius: 4px;
}
fieldset.collapsed legend {
  -khtml-border-radius: 4px;
  -moz-border-radius: 4px;
  -webkit-border-radius: 4px;
  border-radius: 4px;
}
fieldset legend a {
  color: #3b3b3b;
}
fieldset legend a:hover,
fieldset legend a:focus,
fieldset legend a:active {
  color: #000;
}
fieldset .fieldset-wrapper {
  padding: 0 10px;
}
fieldset .fieldset-description {
  margin-top: 5px;
  margin-bottom: 1em;
  line-height: 1.4;
  color: #3c3c3c;
  font-style: italic;
}
input {
  margin: 2px 0;
  padding: 4px;
}
input,
textarea {
  font-size: 0.929em;
}
textarea {
  line-height: 1.5;
}
textarea.form-textarea,
select.form-select {
  padding: 4px;
}
input.form-text,
textarea.form-textarea,
select.form-select {
  border: 1px solid #ccc;
}
input.form-submit:hover,
input.form-submit:focus {
  background: #dedede;
}
.password-suggestions ul li {
  margin-left: 1.2em; /* LTR */
}
.form-item {
  margin-bottom: 1em;
  margin-top: 2px;
}
.form-item label {
  font-size: 0.929em;
}
.form-type-radio label,
.form-type-checkbox label {
  margin-left: 4px;
}
.form-type-radio .description,
.form-type-checkbox .description {
  margin-left: 2px;
}
.form-actions {
  padding-top: 10px;
}
/* Contact Form */
.contact-form #edit-name {
  width: 75%;
  -khtml-border-radius: 4px;
  -moz-border-radius: 4px;
  -webkit-border-radius: 4px;
  border-radius: 4px;
}
.contact-form #edit-mail {
  width: 75%;
  -khtml-border-radius: 4px;
  -moz-border-radius: 4px;
  -webkit-border-radius: 4px;
  border-radius: 4px;
}
.contact-form #edit-subject {
  width: 75%;
  -khtml-border-radius: 4px;
  -moz-border-radius: 4px;
  -webkit-border-radius: 4px;
  border-radius: 4px;
}
.contact-form #edit-message {
  width: 76.3%;
  -khtml-border-top-left-radius: 4px;
  -khtml-border-top-right-radius: 4px;
  -moz-border-radius-topleft: 4px;
  -moz-border-radius-topright: 4px;
  -webkit-border-top-left-radius: 4px;
  -webkit-border-top-right-radius: 4px;
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
}
.contact-form .resizable-textarea .grippie {
  width: 76%;
  -khtml-border-bottom-left-radius: 4px;
  -khtml-border-bottom-right-radius: 4px;
  -moz-border-radius-bottomleft: 4px;
  -moz-border-radius-bottomright: 4px;
  -webkit-border-bottom-left-radius: 4px;
  -webkit-border-bottom-right-radius: 4px;
  border-bottom-left-radius: 4px;
  border-bottom-right-radius: 4px;
}
/* Disabled form elements */
input.form-button-disabled,
input.form-button-disabled:hover,
input.form-button-disabled:focus,
input.form-button-disabled:active,
.form-disabled input,
.form-disabled select,
.form-disabled textarea {
  background: #ededed;
  border-color: #bbb;
  color: #717171;
}
.form-disabled .grippie {
  background-color: #ededed;
  border-color: #bbb;
}
.form-disabled label {
  color: #717171;
}
/* Animated throbber */
html.js input.form-autocomplete {
  background-position: 100% 4px; /* LTR */
}
html.js input.throbbing {
  background-position: 100% -16px; /* LTR */
}
/* Comment form */
.comment-form label {
  float: left; /* LTR */
  font-size: 0.929em;
  width: 120px;
}
.comment-form input,
.comment-form .form-select {
  margin: 0;
  -khtml-border-radius: 4px;
  -moz-border-radius: 4px;
  -webkit-border-radius: 4px;
  border-radius: 4px;
}
.comment-form .form-type-textarea label {
  float: none;
}
.comment-form .form-item,
.comment-form .form-radios,
.comment-form .form-type-checkbox,
.comment-form .form-select {
  margin-bottom: 10px;
  overflow: hidden;
}
.comment-form .form-type-checkbox,
.comment-form .form-radios {
  margin-left: 120px; /* LTR */
}
.comment-form .form-type-checkbox label,
.comment-form .form-radios label {
  float: none;
  margin-top: 0;
}
.comment-form input.form-file {
  width: auto;
}
.no-sidebars .comment-form .form-text {
  width: 800px;
}
.one-sidebar .comment-form .form-text {
  width: 500px;
}
.two-sidebars .comment-form .form-text {
  width: 320px;
}
.comment-form .form-item .description {
  font-size: 0.786em;
  line-height: 1.2;
  margin-left: 120px; /* LTR */
}
#content h2.comment-form {
  margin-bottom: 0.5em;
}
.comment-form .form-textarea {
  -khtml-border-radius-topleft: 4px;
  -khtml-border-radius-topright: 4px;
  -moz-border-radius-topleft: 4px;
  -moz-border-radius-topright: 4px;
  -webkit-border-top-left-radius: 4px;
  -webkit-border-top-right-radius: 4px;
  border-top-left-radius: 4px;
  border-top-right-radius: 4px;
}
.comment-form fieldset.filter-wrapper .fieldset-wrapper,
.comment-form .text-format-wrapper .form-item {
  margin-top: 0;
  margin-bottom: 0;
}
.filter-wrapper label {
  width: auto;
  float: none;
}
.filter-wrapper .form-select {
  min-width: 120px;
}
.comment-form fieldset.filter-wrapper .tips {
  font-size: 0.786em;
}
#comment-body-add-more-wrapper .form-type-textarea label {
  margin-bottom: 0.4em;
}
#edit-actions input {
  margin-right: 0.6em; /* LTR */
}
/* -------------- Other Overrides ------------- */
div.password-suggestions {
  border: 0;
}
.ui-widget-overlay {
  background: #222222;
  opacity: 0.7;
}
div.vertical-tabs .vertical-tabs-panes fieldset.vertical-tabs-pane {
  padding: 1em;
}
#forum .name {
  font-size: 1.083em;
}
#forum .description {
  font-size: 1em;
}
/* --------------- Search Form ---------------- */
#block-search-form {
  padding-bottom: 7px;
}
#block-search-form .content {
  margin-top: 0;
}
#search-form input#edit-keys,
#block-search-form .form-item-search-block-form input {
  float: left; /* LTR */
  font-size: 1em;
  height: 1.143em;
  margin-right: 5px;
  width: 9em;
}
#search-block-form input.form-submit,
#search-form input.form-submit {
  margin-left: 0;
  margin-right: 0;
  height: 25px;
  width: 34px;
  padding: 0;
  cursor: pointer;
  text-indent: -9999px;
  border-color: #e4e4e4 #d2d2d2 #b4b4b4;
  background: url(../images/search-button.png) no-repeat center top;
  overflow: hidden;
}
#search-block-form input.form-submit:hover,
#search-block-form input.form-submit:focus,
#search-form input.form-submit:hover,
#search-form input.form-submit:focus {
  background-position: center bottom;
}
#search-form .form-item-keys label {
  display: block;
}
/* --------------- Search Results ---------------- */
ol.search-results {
  padding-left: 0;
}
.search-results li {
  border-bottom: 1px solid #d3d7d9;
  padding-bottom: 0.4285em;
  margin-bottom: 0.5em;
}
.search-results li:last-child {
  border-bottom: none;
  padding-bottom: 0;
  margin-bottom: 1em;
}
.search-results .search-snippet-info {
  padding-left: 0;
}
/* -------------- Shortcut Links -------------- */
.shortcut-wrapper {
  margin: 2.2em 0 1.1em 0; /* Same as usual h1#page-title margin. */
}
.shortcut-wrapper h1#page-title {
  float: left; /* LTR */
  margin: 0;
}
div.add-or-remove-shortcuts {
  padding-top: 0.9em;
}
.overlay div.add-or-remove-shortcuts {
  padding-top: 0.8em;
}
/* ---------- Admin-specific Theming ---------- */
.page-admin #content img {
  margin-right: 15px; /* LTR */
}
.page-admin #content .simpletest-image img {
  margin: 0;
}
.page-admin-structure-block-demo .block-region {
  background: #ffff66;
  border: 1px dotted #9f9e00;
  color: #000;
  font: 90% "Lucida Grande", "Lucida Sans Unicode", sans-serif;
  margin: 5px;
  padding: 5px;
  text-align: center;
  text-shadow: none;
}
.page-admin-structure-block-demo #featured .block-region {
  font-size: 0.55em;
}
.page-admin-structure-block-demo #header .block-region {
  width: 500px;
}
.page-admin #admin-dblog img {
  margin: 0 5px;
}
/* Fix spacing when Seven is used in the overlay. */
#system-theme-settings fieldset {
  padding: 0;
}
#system-theme-settings fieldset .fieldset-legend {
  margin-top: 0;
}
/* Configuration. */
div.admin .right,
div.admin .left {
  width: 49%;
  margin: 0;
}
div.admin-panel {
  background: #fbfbfb;
  border: 1px solid #ccc;
  margin: 10px 0;
  padding: 0 5px 5px;
}
div.admin-panel h3 {
  margin: 16px 7px;
}
div.admin-panel dt {
  border-top: 1px solid #ccc;
  padding: 7px 0 0;
}
div.admin-panel dd {
  margin: 0 0 10px;
}
div.admin-panel .description {
  margin: 0 0 14px 7px;
}
/* ---------- Overlay layout styles ----------- */
.overlay #main,
.overlay #content {
  width: auto;
  float: none;
}
.overlay #page {
  padding: 0 2em;
}
.overlay .region-page-top,
.overlay #header,
.overlay #page-title,
.overlay #featured,
.overlay #sidebar-first,
.overlay #triptych-wrapper,
.overlay #footer-wrapper {
  display: none;
}
.overlay-processed .field-type-image {
  display: block;
  float: none;
}
.overlay #messages {
  width: auto;
}
/* ---------- Poll ----------- */
.node .poll {
  margin: 2em 0;
}
.node .poll #edit-choice {
  margin: 0 0 1.5em;
}
.poll .vote-form {
  text-align: left; /* LTR */
}
.poll .vote-form .choices {
  margin: 0;
}
.poll .percent {
  font-size: 0.857em;
  font-style: italic;
  margin-bottom: 3em;
  margin-top: -3.2em;
  float: right;
  text-align: right;
}
.poll .text {
  clear: right;
  margin-right: 2.25em;
}
.poll .total {
  font-size: 0.929em;
  font-style: italic;
  text-align: right; /* LTR */
  clear: both;
}
.node .poll {
  margin: 1.8em 0 0;
}
.node .poll .text {
  margin-right: 6.75em;
}
.node .poll #edit-choice {
  margin: 0 0 1.2em;
}
.poll .bar .foreground {
  background-color: #666;
}
#footer-wrapper .poll .bar {
  background-color: #666;
}
#footer-wrapper .poll .bar .foreground {
  background-color: #ddd;
}

Can you help me further please? Thanks.
Yes, I'll make sure to resize the logo in order to make it look good on any device.

Hi, The link to your test site doesn't seem to be working

Sorry, server's down. Moved to a temporary host: http://dorofanclub.altervista.org/
Thanks

Here is some css to try.

#header div.section {
    padding-top: 514px;
    position: relative;
    z-index: 0;
}
#logo {
    float: none;
    left: -450px;
    position: absolute;
    top: 0;
    z-index: -10;
}

Even though there's still some padding on the top, the CSS works. Thank you!