I have a problem with my checkout form in my theme. The width of the main content is too narrow (only 410px wide plus a margin), and would need to have the form checkout uses narrowed a tiny little bit.
This is what it looks like in a screenshot:
I am not a coding guru, so I need a lead where to look to fix this problem, whether this is the theme problem, the form problem, or the checkout code problem.
Thnx in advance.