Working with an unknown theme… Need help editing page width! "builder-module"?

I’m working on an unknown theme, I’m assuming it’s custom. It seems several years old. Looks good on the front side, but the stylesheet is not something I’m used to. I’m simply trying to change the content width of the page and narrow the “sidebar” to 0.

I used firebug to make the changes, but the fields to edit aren’t in the style.css and I have no idea how to make the changes. I’ve even tried the firefox css plugin to save firebug changes and that doesn’t help.

Here’s the site:
http://www.bustedknucklefilms.com

No clue what the theme is.
This is the html that I’m trying to edit… any idea how to make the changes in stylesheet?

<div id="builder-module-4b7369aabf83d" class="builder-module builder-module-content builder-module-2 builder-module-content-1 builder-module-content-last builder-module-before-footer builder-module-after-html clearfix">
<div class="builder-module-block-outer-wrapper left clearfix" style="width:610px; overflow:hidden; padding:0; margin:0">
<div class="builder-module-block-outer-wrapper right clearfix" style="width:350px; overflow:hidden; padding:0; margin:0;">

the stylesheet shows this:

/*********************************************
	Container Div
*********************************************/
.builder-container-outer-wrapper {
	background: transparent;
	margin: 0em auto;
	border: 0em solid #000;
	display: block;
}

Any ideas?