2014 Theme background colors

Does anyone know how to change the background color (particularly the white space in the content area) using the 2014 theme? I came pretty close but it’s driving me nuts. I can’t figure out how to change it to all black. Essentially, I want the entire site to be 0a0a0a (slightly lighter than pure black) with white/grey text.
Is it even possible to change white background to a different color? I’ve had similar problems with previous WordPress themes.
Personally, I don’t care for sites with bright, white backgrounds because it’s like staring into a light bulb LOL
I prefer darker sites because they’re easier to read and you don’t ruin your vision.

HEEEEELP! ??