How do I enlarge the tab buttons

Im using the U-Design template and I would like to increase the tab sizes that are listed in the Content Toggle, Tabs and Accordion section. Whenever I change the text size to h4 all the text below the tab inside the columns increase. I just want bigger tab sizes.
Thank you.

Contact the theme author. He/She would support you on this.

And, you can do that here, at the Support tab of the item’s page on ThemeForest: