Page scrolls far to the right – how can I fix this?

Greetings all. If you’ll head on over to my site, https://www.ilovehorror.net, you’ll see how it scrolls wwwwwwaaaaaaaaaaaayyyyyyyyyyyy over to the right. How can I fix this? I am a total CSS newb and jumped right into this knowing absolutely nothing.

Also, if you’ll notice the “Recent Comments” you’ll see how the text flows out of the frame and into the grey. How would I go about making it to text that is too long wraps onto a second line?

Many thanks in advance.