Picture Display Size

I want to display a smaller picture size so I can get more pictures. I have added the below text to the .module and .css but nothing happens. could you let me know what I am doing wrong? Thank you!
Mark

.MODULE - BELOW

/**
* Implementation of hook_init().
*/
function latest_members_init() {
drupal_add_css(drupal_get_path('module', 'latest_members') .'/latest_members.css');
if (!isset($_SERVER['REQUEST_TIME'])) {
$_SERVER['REQUEST_TIME'] = time();
}
}

.CSS - BELOW

#latest-members {
height: 75px;
width: 75px;
overflow: auto;
}