Chrome source files
Looking under the hood at the Chrome dev tools and user agent styles, I came across some of the source files that power the dev tools
devTools.css is worth taking a look a look at as it has the base styles for the syntax highlighting used in the dev tools. Search for /* inspectorSyntaxHighlight.css */.
If you’re interested in taking a peek, I’d point you to resources.pak located in /Applications/Google Chrome/Contents/YOUR_VERSION/Google Chrome Framework.framework/Resources/resources.pak.