jweaving on "Help with adjusting width of theme's body?"

First of all, you should consider that some visitors to your website may have wider monitors than you do.

A reasonably sized "wrapper" is common among websites to make sure that content doesn't get stretched out too thin at wider window widths.

Anyway, you can use the following custom CSS to adjust:

@media screen and (min-width: 860px) { #front-pagecontent .entry-content { max-width: 1000px; }
}

I just made up the 1000 number. Previously, it was 560. Adjust it to whatever you feel comfortable with.

Going back to my first point, I'd also recommend decreasing the font size of the page in your browser (usually by pressing ctrl/cmd plus the - key) to get an idea of how it will look on wider screens.