Opencart Popup Window not sizing correctly - popup

Question

I am using OpenCart 1.5.6 and a version of the YooResponsive theme.
When I am in my shopping cart and choose to Estimate Shipping, I add my state/zip and click the button and I get a popup box that is too small.
Both the right side and the bottom are cut off. The HTML code on the live site is:
<div id="colorbox" class="" style="padding-bottom: 57px; padding-right: 28px; top: 456px; left: 653px; position: absolute; overflow: hidden; width: 572px; height: 343px;">
If I use firebug to change width: 572px; height: 343px; to width: 600px; height: 400px; it looks correct but I can't seem to find anywhere in the code to make these changes.
This looks like it is hard coded rather than brought in from a css file.
In my cart.tpl I have the following javascript code:
$.colorbox({
overlayClose: true,
opacity: 0.5,
width: '600px',
height: '400px',
href: false,
html: html
});
This code seems to be setup right but why is it not displaying at the correct size?
It also does this with the Terms and Conditions link that shows up at the end of the checkout process. I imagine that if I check other pop-up boxes it would do the same.
One thing I noticed was that for both pop-up boxes (which are different sizes) the measurements that change are exactly the same as the padding in the HTML code (padding-bottom: 57px; padding-right: 28px;). So the height is always 57px smaller and the width is always 28px smaller. If I use firefox to change the padding in the HTML code above it does nothing to make it display correctly, only by changing the height and width does anything change.
Any help would be much appreciated.

Answer 1

Nevermind, I got it! I had a stylesheet attached to the site that was changing the box-sizing
The code was:
* {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
And I just added this code to the stylesheet.css to override it:
#colorbox {
-webkit-box-sizing: content-box !important;
-moz-box-sizing: content-box !important;
box-sizing: content-box !important;
}