The buttons were against a solid white background. It was also the only test we ran at the time to ensure that we weren't blowing the test results. I think the

The buttons were against a solid white background. It was also the only test we ran at the time to ensure that we weren't blowing the test results. I think the entire composition of the page matters though. Conversion rates for an element don't necessarily cross-over to a completely different layout, so testing is always still a good option.