CSS Styling of Fundraiser Panel Widget vs. Fundraiser Page

I am working on doing some custom styling for my fundraising donate panels. I am running into some issues. Forgive me. I am not a CSS expert, or I should be able to figure this out. See my current progress here:

http://www.minutemenministries.org/donations/minutemen-headquarters-project/

Notice the donate panel in the main content section and the one in the widget sidebar. I love how the one in the main content looks, but I do not like how the widget donate button hangs off the bottom.

I have tried to use the ":after" pseudo class adding a period after the button, but it doesn't seem to be working to stretch the background down. Is there to resolve this, or is there a way to style the widget and main content panel differently?