Stylesheet in 1.2.7 - wanting to add a border...

I've had to return to v1.2.7 for now as I'm just not 100% comfortable using 1.3 in a multilingual setup (I feel like I've wasted 2 wks of time and it's just too buggy for my client yet).

I have gone back and now am having to relearn the Stylesheet in 1.2.7. :ohmy: I have figured out where most of the items cross over from 1.3 to the older stylesheet but I cannot figure out how to put a border around the entire store. It was the "mainwrapper" in the new stylesheet....

Thank you.

green border:

.main_page{
  width: 100% !important;
  background-color: #ffffff;
  border-right: 1px solid green;
  border-left: 1px solid green;
  border-bottom: 1px solid green;
  padding: 5px;
}