If you want to make a few design tweaks to a WordPress theme (and don’t see an option for it in the Customizer), you’ll likely need to use some custom CSS. Thankfully, WordPress has a great built-in Custom CSS module that allows you to safely add CSS code or override existing styles. This gives you almost unlimited design control over a site!
This video explains how to find the selectors in your theme using the Chrome developer tools and then add your own custom styles in WordPress.