Do you mean the pink box?
Generally speaking if you ask me, your whole layout isn't responsive, and it's mostly the fault of the train wreck of how not to build a website known as bootcrap. It's saddled you with uselessly vague classnames, broken methodology, and a markup that to be frank, I'd punch myself in the face before trying to deploy on a website.
Likewise, the use of fixed measurements for fonts (aka pixels) is an inaccessible mess.
My advice would be to pitch that entire mess in the trash and start over with semantic markup, separation of presentation from content, and no goofy "crutch" in the form of frameworks that are taking something simple -- responsive layout -- and turning it into a confusing bloated slow loading inaccessible wreck. You have an EXCELLENT example of everything wrong with bootcrap, and many "modern" development methods that just makes me go "modern? Really? Looks like 1997 to me!"
Sorry if that seems harsh, but it's the truth of the matter; there isn't anything there I'd even waste a second on trying to salvage -- as evidenced by the 130k of markup to deliver 4.5k of plaintext and maybe a dozen content images... Easily ten times or more the code that should be needed on such a simple design.
IF I have time later since insomnia has set in, I'll take a stab at a quick rewrite from scratch just to show you what I mean. It will likely swing an axe at 90%+ of your HTML, 75%+ of the CSS that's in use, and probably most all the "JS for nothing"... since there is no legitimate excuse for 300k of CSS or 1.3 megabytes of JS for THAT!