by Mary Evans.
Some themes allow you to add CSS. If you use the Formal White theme, that allows you to make changes to the theme and to the CSS too.
All the theme setting pages related to all the themes, are listed at this point in the Site Administration side block.
Site Administration > Appearance > Themes --> at this point you will see list of theme names which have custom setting pages. Click the Formal white link and it will display a form where you can add various settings like font size, colors, and also add some CSS in a special text area provided.
Happy moodling!
Mary