Well, did you see what happens when the screen is made smaller? It kind of breaks header.
Yes, it does…but you specifically stated that you wanted the site to be unresponsive.
You’re gonna have to commit one way or the other.
At the very least you need to set the width of the “header” so that it’s not 100% of the container.
Offhand it needs to be the same width as the column div that’s “underneath” it.
<div class="col-md-8 dmbs-main pull-left">
…but as I said, unless you make some fundamental restructuring it’s hard to be more helpful.