"Choose Option" Button Style Different From "Add to Cart"

I love the look of the "Add to Cart" button but I have 1 item that has 2 variations. On my products page the button there shows up as "Choose Option" which is fine except that it has a totally different style from the "Add to Cart" button... How can I get it to look like the rest but still say "Choose Option"? I didn't see a way to do it in the settings.