어느게 맞는걸 까요??

<link rel="stylesheet" href="<?php echo G5_BBS_URL ?>/css/common.css" type="text/css">
<link rel="stylesheet" href="<?php echo G5_BBS_URL ?>/css/main.css" type="text/css">
add_stylesheet('<link rel="stylesheet" href="'.G5_THEME_PATH.'/css/common.css">', 0);
add_stylesheet('<link rel="stylesheet" href="'.G5_THEME_PATH.'/css/main.css">', 0);
add_stylesheet('<link rel="stylesheet" href="'.G5_URL.'/css/common.css">', 0);
add_stylesheet('<link rel="stylesheet" href="'.G5_URL.'/css/main.css">', 0);

테마에서.... ccs 적용이 안되서요..

저렇게 해도 안먹히네요....