Remove Drupal stylesheets with hook_css_alter

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When you start developing themes, you'll find out that there will be a lot of stylesheets loaded in by default. To remove those stylesheets from your own theme's template.php, you have to overwrite hook_css_alter and remove the stylesheets from the array.

To make things a bit clearer, take a look at the following snippet:

* Remove Drupal's core system stylesheets.

function THEMENAME_css_alter(&$css)
$path_system = drupal_get_path('module', 'system');

$remove = array(
$path_system . '/system.base.css',
$path_system . '/system.menus.css',
$path_system . '/system.messages.css',
$path_system . '/system.theme.css',

// Remove stylesheets which match our remove array.
foreach ($css as $stylesheet => $options) {
if (in_array($stylesheet, $remove)) {

As you can see, it removes all system module stylesheets from the stylesheets that will be rendered. This can be of course any stylesheet of any module you want.