How to add code syntax highlighting to blogger

You can add the highlights library

Add this file to your blogger code.

<link rel="stylesheet"
      href="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.9.0/styles/androidstudio.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/highlight.js/9.9.0/highlight.min.js"></script>
<script>hljs.initHighlightingOnLoad();</script>

Note that this highlighting library requires your post's HTML to wrap the relevant code snippets in a code tag, with the code tag having the class of the relevant language.

For example:

<pre><code class='html'> [My HTML goes here] </code></pre>