where to find post background effect code (example)

Hi folks,
I'm trying to edit the template of a blog that currently has a mono-color background to add a different background color for posts (to help differentiate between them). See here for an example of what I'm looking to accomplish. The template of the site I'm looking to edit is rather complicated however so I cannot just use the blogger design tools to do this I have to figure out how to do it via the HTML code itself. Is it possible for someone to point me in the direction of the portion of the template to play around with in order to accomplish this effect? And also anything special I might need to do to replicate the above effect?

Here is the template I'm trying to modify: http://newsecuritymeat2.blogspot.com/. And here the post background style I'm looking for: http://skyyaatest.blogspot.com/.

Go to Design > Edit HTML > download a full copy (just in case)

Find this code:
.post {
margin:.5em 0 .5em;
border-bottom:1px dotted $bordercolor;
line-height:2em;
padding-bottom:.5em;
text-align:justify;
}

After that code paste this code:

.post-outer {
-moz-border-radius:10px 10px 10px 10px;
background-color:#F5F5F5;
border:1px solid #DDDDDD;
margin:0 0px 20px;
padding:15px 20px;
}


This is just for the post area, if you need something else just ask.

Awesome, exactly what I was looking for - thanks a lot.

Hi Gyms,
One other question. I followed your directions and it worked great. Only kink is that in the new template, on Chrome and IE, the edges of the background color block show up squared and in Firefox they show up rounded. I'd love to be able to choose one way or the other (preferably rounded). Any suggestions?

Another background code question, but this time for the entire page, not just the post background. How do I grab the code for this transparent background (http://skyyaatest.blogspot.com/) for use in this template (http://newsecuritymeat2.blogspot.com)? I tried copying the content-outer and content-inner code from one to the other but it had no effect. Any tips? Templates are attached and thank you!