Button color for selected categorie

Dear Sir / Madam,

I have made a portfolio with three categories (‘Landscapes’ ‘People’ ‘Places’), but is it possible to give the button of the selected category (for example ‘Landscapes’ ) a color, so that visitors immediately see in which category they are looking?

See for example: https://demos.cpothemes.com/allegiant/portfolio-category/landscapes/

Thank you in advance.

Octavii