How was this padding added?

HI all,

I inherited the CC account from previous employees, and I've been reviewing some of the templates and previous campaigns they've made.

I found this one and I'm flummoxed. How did they:

1. Round the content box edge
2. Add padding around most of the content boxes. (I checked, they are not placed as images; they're editable) The banner I get--PNG file with a drawn shadow and transparent background to give the illusion of depth--but how did they make all the other content boxes indented?

I suspect this was a custom HTML deal. I'm hoping I've just missed an advanced editor in the CC system or something.