Highlighting Code
Simplicity is GitHub Pages-ready, that means, it uses Rouge for syntax highlighting. To adjust the code highlighting to your taste, Just open _sass/_07_syntax_highlighting.scss and tune the colors to your taste.
To learn more, read »Mixing Color for the Web with Sass« or check out the Sass-manual with all the functions.
Rouge
To render a code block with syntax highlighting, surround your code as follows:
If you need lines, add linenos
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{% highlight ruby linenos %}
def foo
puts 'foo'
end
{% endhighlight %}