Board Thread:Support Requests - Getting Technical/@comment-5454372-20140626141539/@comment-957747-20140626181659

Common.css doesn't work that way, what you are wanting is Special:MyPage/global.css (or Special:MyPage/wikia.css, but that will only affect this wikia).

Also, if you are just using User:Undead.exe/Laser_Cannon_Cursor_Blue.css as the import, why not just move the cursor code to your global.css file and call it a day?