Button Styling Problem

Hi,
I want to style the button on my pricing table. Firebug tells me the styling is in my template file:

.osm-pricing-table .btn-singup {
background-color: #006dcc;
background-image: linear-gradient(to bottom, #0088cc, #0044cc);
....

I looked for those values in my template file, in style.css of membership pro and in the bootstrap css but I could not find it. Anyone knows how to change that button which is shown in the picture?



Thanks,
david