For cPanel & WHM version 60
(Home >> Preferences >> Change Style)
Use this interface to choose a style in order to customize the cPanel interface's appearance.
To change your interface's style, click Apply for the desired style. The interface will refresh in the newly-selected style.
To set a style as the default style, click Set as Default for the desired style.
When you set a style as the default style, the system does not automatically apply that style to your account. You must also click Apply to apply that style for your account.