Car Demons Plug In – Theme Problem

I am working on a simple Car Website and I have run into a bit of a snag. When it displays the cars (both all cars, and individual cars) and pushes past the menu on the left side. This can be seen on these pages:
https://www.gsautomall.com/cars-for-sale
and here:
https://www.gsautomall.com/cars-for-sale/test-car

Using Chrome’s “view elements”, I can fix this error by adding some code to the demon container like this:

<div id=”demon-container” style=”margin-left:275px;”>

This is just to view it correctly but where is the file to change this permanently? I looked all over the ftp site but cannot seem to find the right php file. Any help would be appreciated. Thanks