[Syntax highlighting](http://en.wikipedia.org/wiki/Syntax_highlighting) is a feature that displays source code, in different colors and fonts according to the category of terms. This feature facilitates writing in a structured language such as a programming language or a markup language as both structures and syntax errors are visually distinct. Highlighting does not affect the meaning of the text itself; it is intended only for human readers.
To modify styling and highlight colors edit `/assets/less/pygments.less` and compile `main.less` with your favorite preprocessor. Or edit `main.css` if that's your thing, the classes you want to modify all begin with `.highlight`.
To modify styling and highlight colors edit `/assets/less/coderay.less` and compile `main.less` with your favorite preprocessor. Or edit `main.css` if that's your thing, the classes you want to modify all begin with `.coderay`. Line numbers and a few other things can be modified in `_config.yml` under `coderay`.