This feature is not available in free version of the theme form customize section but easily available in the pro version of the theme.
There are other more feature available in pro version. You can check here http://themepalace.com/downloads/education-hub-pro/
However this can be done by adding some custom CSS in free version.
For this you need to go to Admin Panel / Appearance / Customize / Theme Options / Advanced Option.
In this section you will see a box to write custom CSS. In this box copy and paste following CSS.
Hope this will help to resolve your issue.
Let me know how it goes.
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