Category Heading Colour Change

[DCS4U]

Hi, on my PrestaShop main front page, I was wondering how I can amend my horizontal main top menu bar so that the root categories are more prominent?

At the moment they are black text on white, but with the image banner slider, we feel the page isn't very obvious from an initial landing perspective for the navigation of products.  I would like to try to amend the colour of the text headings to a light blue and maybe increase the size to make the headings more prominent on the page?

 

Any tips or advice on how to do complete would be greatly appreciated, thanks everyone!