Fix side padding

[rick02840]

Side padding: At the site’s max width of 1200px, there’s currently 70px of space between the site logo and the left edge of the browser window, and the “Donate” button and the right side of the browser window. In the designs it’s much lower, 40px.
Above is copied from: https://docs.google.com/document/d/1fN-RnlYSRUHRyFX4jLl2dQ0cS5J3ol-x55oa8Uov478/edit#