How do I change the font size of a tab?

Cascading Style Sheets (CSS) are an industry-standard way of styling a web page. HTML renders the page's content, and CSS files determine the look and feel.

You can upload a CSS text file, or type in a stylesheet, and apply it to a space or even a whole Confluence site.

Note: By default, only system administrators can edit the CSS for a space or for the site. To allow any user with Space Admin permissions to edit the CSS for a space, go to
 → General Configuration → Security Configuration and select  Custom Stylesheets for Spaces.