Remove Drupal core stylesheets with hook_css_alter

Published on 24 February, 2012

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 hookcssalter 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.

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