To change the Theme of an OpenScholar site, go into the Admin Bar > Appearance > Themes.
This page displays different themes that can be applied to a site. Some themes even have something called flavors. With Flavors, the design of the page stays the same but either a background color or a background image changes.
Click on the theme to choose it, click the Save button to apply it. OpenScholar users can not edit the HTML or CSS of any Themes.
*Note: When changing a theme, the layout of the last theme is kept, so this may effect the way the site is displayed in a browser. When changing a theme, always keep in mind the Layout may need to be changed so it displays the content as intended.