Button ? ( mask)

Whats up everyone

I have an about new portfolio and contact
button on a 30 degree angle over some text _ I just what the buttons to change colors on mouse over _ but in just changing the color the text seemed to flicker _ Putting a square behind the text stopped it from flickering _ How can I make the square invislbe _ since I cant use masks inside a button symbol _
Or is there another way to this
thanks for your time