I have created a portfolio page with a left side bar and six thumbnails. In design mode it fits entire whole screen width. But when I preview it, the content does not fill the screen width. There is extra space to the right and bottom. The thumbnails are also pinned to the upper left so that they remain static and don't move all over each other.
I've tried everything. Nothing works. I can't do a fullscreen widget or background fill since these are thumbnails.