This tool will generate for you a working xss bypass for your css files.
Just get the direct link or URL of your external file and paste in the box below (example: http://www.your-external_file.css).
Click generate and some converted codes will be generated. After generating your codes, Copy them and paste it in your Media Box. Press the Save button and view your profile. Wait for a few seconds for the layout to load. If the layout doesnt appear, hit F5 in your keyboard or log out then log in again. Paste the linker again everytime you will edit your profile.