admin text - white on white

Hey here is what I did to get rid of that. I inserted this text into the style.css file that came with the theme. some of the lines probably aren't necessary but i don't know enough about it really, just copied some stuff out of the system style sheet and inserted it here and changed the colors to stuff that would be readable.

/* stuff I've changed */

th.active img {
display: inline;
}
tr.even, tr.odd {
background-color: #5A3D59;
border-bottom: 1px solid #ccc;
padding: 0.1em 0.6em;
}
td.active {
background-color: #ddd;
}
tbody {
border-top: 1px solid #ccc;
}
tbody th {
border-bottom: 1px solid #ccc;
}
thead th {
text-align: left;
padding-right: 1em;
border-bottom: 3px solid #ccc;
}
div.admin-required {
color: #5CF;
}
div.admin-dependencies {
color: #5Cf;
}
span.admin-enabled {
color: #54F;
}

/*End stuff I've changed */

I'm having a similar problem with the TreeDesert theme. This theme doesn't have a style.css. I tried using the fix above on siteground.css, but no dice. Any other ideas?