Activate your CSS Runboard requires you to activate your CSS area before anything you place in it is acted on by the system. This requirement means you can play around in the custom CSS panels as much as you like without fear of messing things up. When you are ready to take the plunge and use your CSS settings you go to "Control Panel :: Board management :: Edit layout/colors of your board" and make sure you have the "Use extra CSS options?" box checked on the form.