Order summary component main, HTML, CSS, Flexbox

This is my second attempt at this challenge, implementing several small changes that were recommended when I submitted my first attempt. I added the box shadow on the 'proceed to payment' button (that I missed first time around) and added a 'main' tag for accessibility. I initially had an issue where the background image didn't seem to match the image provided. I figured out that I needed to add a background color AND the background image. My only issue now is that the margin around the "plan" section and the button seems too small. When I change the margin, nothing seems to happen. Any thoughts/suggestions? Thanks!