add an hover effect on a element of layerslider in a easy way?

Hi, kriesi team

I’m doing this page with layerslider and buttons :

http://new.centrovelicotorreguaceto.it/corsi

in every layerslider i placed text layers with links
for every text layer i set the “id” and “class” attributes

is there an easy way to target this “id” and “class” attributes in the custom.css to set an hover effect on them?
(i’d like to change the text color or the background color for a specific element, or a class of elements)

thank you