Fix news layout for firefox.

Fix the layout for Firefox (Tested with version 30, 31 and 32).
Without, the first post is unreadable small at the right edge of the window:

Before: http://www.browserstack.com/screenshots/6b8d1e072bd491f1faa29c5a1883a2fda0a06792
After: http://www.browserstack.com/screenshots/14f8f0a2b83f6a84087a8a7470ec4a308fc82e7b