Option 1
To override a core or contributed module style sheet, it must be specified in your theme's .info file.
For example, system-menus.css is located at "modules/system/system-menus.css". If you place a file with the same name in your theme's folder and add the following entry to the .info file, the original system-menus.css file will be ignored and your version will be loaded in its place.
1.stylesheets[all][] = node.css
2.stylesheets[all][] = defaults.css
3.stylesheets[all][] = system.css
4.stylesheets[all][] = system-menus.css
5.stylesheets[all][] = user.css
Adding the override for a style sheet that does not exist inside the theme will omit the core or module style sheet.
Option 2
This can achieved using the preprocess function also, which should be written in your theme's template.php file
<?php
/**
* Override or insert PHPTemplate variables into the templates.
*/
function phptemplate_preprocess_page(&$vars) {
// get all the CSS file which are loaded
$css = drupal_add_css();
// since all the CSS files loaded from the modules will be done using the tag 'module'
// clear the module CSS files
$css["all"]["module"] = array();
// re-assign the CSS files to the styles varaible
$vars["styles"] = drupal_get_css($css);
}
?>Remember to clear your cache after making this change! Navigate to Administer > Site configuration > Performance. Scroll to the bottom and click, "Clear cached data."
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