Changed margin .row under .container-fluid to match padding

The default padding for `.container-fluid` is `0 15px`, and the margin for `.row` is `0 -15px` to compensate. The padding for `.container-fluid` was overridden to be `0 5px`, so I changed the `.row` directly under it to have the margin `0 -5px`.

The reason it matters is that when the window width is smaller than the md screen size screen, you get 20px of overflow because of the mismatch.