Yes, you can use our CSS overrides functionality to do this. See the below on how to use CSS overrides with CB templates.
www.joomlapolis.com/blog/kyle/18711-template-css-overrides-made-easy
As for the selector for whatever you're wanting to restyle you'll need to right click and inspect the page, which will reveal the CSS in your browsers developer console (typically can press F12 to open directly).