CSS is the language for styling an HTML document, and specifies how various HTML elements should appear.
Change the Styles Settings
Follow these steps to add CSS to your website:
Login to the Site Manager.
In the menu, click to expand the Design settings (see figure below).
Click the STYLES item to display the popup window.
Paste your entire CSS text into the field. The example below contains code that specifies the styling of the body text, the H1 heading, and the paragraph.
Click “Save Stylesheet” to commit your changes and close the popup window.