Board Thread:Support Requests - Designing Your Wiki/@comment-35489678-20201009122552/@comment-46664455-20201009141752

Okay. Fandom has many help pages about css you can view (Since it is complicated to explain):
 * Help:Including additional CSS and JS Additional CSS
 * Help:CSS and JS pages Lists the CSS pages.
 * Help:How to import Google Fonts Importing Fonts.
 * Help:CSS and JS customization CSS Details.
 * Help:Advanced CSS and JS Advanced CSS.

If you are having still having trouble, you can ask for help from users here!