Quizz general

I've started to work on some Quizz in Storyline.

I have a test question and a multiple choice answers.

The answers are colored in blue

When playing the quizz, the dark blue change to light blue on mouse roll-over.

I would like to delete this change on roll-over or, il not possible, at least get a more appropriate color;

Could someone tell me how this is possible or refer me to the existing e-larning (I could not find one by myself but may be someone knows)

Any help on that will be very much appreciated.

Patrick MORIN