The portal uses a CSS (cascading style sheet) to control the fonts, styles and colours applied across the site. The CSS maintained in this editor is the default CSS applied to all site pages. 
In order to access such a management area, when logged in as an administrator, select the option “Site Settings” in the menu or click the icon . Click Stylesheet Editor.

Update the styles as required.
Click Save Style Sheet.
Hold down the Ctrl button and press the F5 button, or click the Refresh button on the browser to view your changes.

How to Restore the Default Style Sheet:
Click Restore Default Style Sheet.
Hold down the Ctrl button and press the F5 button, or click the Refresh button on the browser to view your changes.