Website Design Help

Ok, today I went to visit my website and the layout is messed up for some reason. I made absolutely no changes to the CSS or anything so I can't figure how the website changed overnight, but I need someone to basically figure out how to restore it to the way it was. Should probably be very simple to someone who knows what they are doing. I know a fair amount of html and css, but don't have a lot of time to mess around with it. It's a Wordpress blog using the Arras Theme. I attached pics to give you examples of what changed. Thanks.