修改 theme 目錄下的 config.php,新增以下內容,custom即對應/style/custom.css
$THEME->sheets = array('custom');
如果需要有兩個css檔,則可再往後加,custom2則對應/style/custom2.css
$THEME->sheets = array('custom','custom2');
Reference: How to customise CSS in our premium Moodle themes