I’m having some problems with Four Column block width in bootstrap 3. It doesn’t re-size to the column width and its width is only effected by the padding provided.
There is just too much padding on .quizimgblock .textbox, and since you have .wrapper as display: inline-block, it’s not expanding the full width like it should. So, I would give .wrapper a width: 100% so it’s actually the full width it should be, and remove, or greatly reduce the padding of .quizimgblock .textbox.