Drupal - Theming - Remove unnecessary CSS

gistfile1.txt

To remove unnecessary css in drupal
add this code to template.php

/**
 * Clean system css
*/

function uk_css_alter(&$css) {
  foreach ($css as $key => $value) {
    if ($value['group'] != CSS_THEME) {
      $exclude[$key] = FALSE;
    }
  }
  $css = array_diff_key($css, $exclude);
}

To override system css, add the following code and files to theme.info (the techinique is FOAD)
stylesheets[all][] = css/foad/ctools.css
stylesheets[all][] = css/foad/field.css
stylesheets[all][] = css/foad/node.css
stylesheets[all][] = css/foad/system.messages.css
stylesheets[all][] = css/foad/system.menus.css
stylesheets[all][] = css/foad/user.css
stylesheets[all][] = css/foad/views.css