To insert highlight code inside of a post, it’s enough to use some specific tags, has directly described into the Jekyll documentation. In this way the code will be included into a .highlight CSS class and will be highlight according to the syntax.scss file. This is the standard style adopted by Github to highlight the code.
This is a CSS example:
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body {
  background-color: #fff;
  }
h1 {
  color: #ffaa33;
  font-size: 1.5em;
  }
And this is a HTML example, with a linenumber:
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<html>
  <a href="example.com">Example</a>
</html>
Last, a Ruby example:
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def hello
  puts "Hello World!"
end
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