The appearance of your site is determined by its CSS Theme. CSS stands for Cascading Style Sheets, and it essentially defines rules and properties of various elements on a page. You as a site administrator have the option to change the site's theme or modify it to fit your purposes.
To read more about how to customize your CSS, read on the CSS Themes help page.
The following are style sheets defined on your site:
Adding a New Theme
Use the module below to add a new CSS theme page: