Fluid google template

I'm using the Picture Window template but wanted a fluid (stretchy) design so that folk with wide screens don't need to see my lines of computer program wrapped in a terribly hard to read fashion.

I was able to find notes on adapting this template with custom CSS.

body {
padding-left: 50px;
padding-right: 50px;
}

html body .content-outer {
max-width: 1600px;
}

which does the trick nicely