Thread:Project:Support desk/common.css/reply (7)

Use the developer tools of your web browser and inspect the element of your wiki. You'll see that it has some class names applied to it. One of them is "page-encoded_page_name" which matches the current page name, but encoded so it can be used as a class name. In addition, the main page has "mainpage" as a class name.

Since CSS rules are targetted to specific elements on a page, you should use the  selector before each selector you pant to apply to only that page.