Change color of coupon button

I wont to change the color of text inside coupon button. Where can i do that?

Hello,

Could you provide an URL to your website with this element?

I'm using one-page module but the color was the same with original files from Gavick
http://goedkoopledlampen.nl/index.php/winkelwagen

Please add in the css/override.css file the following code:

Code: Select all

span.details-button input.details-button {
    color: #fff;
}