1.Edited the HTML source of the blog theme and inserted these lines toward the end of the <head> section:
<link crossorigin="anonymous" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.3.1/styles/default.min.css" integrity="sha512-3xLMEigMNYLDJLAgaGlDSxpGykyb+nQnJBzbkQy2a0gyVKL2ZpNOPIj1rD8IPFaJbwAgId/atho1+LBpWu5DhA==" referrerpolicy="no-referrer" rel="stylesheet" />
<script crossorigin="anonymous" integrity="sha512-Pbb8o120v5/hN/a6LjF4N4Lxou+xYZ0QcVF8J6TWhBbHmctQWd8O6xTDmHpE/91OjPzCk4JRoiJsexHYg4SotQ==" referrerpolicy="no-referrer" src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.3.1/highlight.min.js"></script>
<script language="javascript" type="text/javascript"> hljs.highlightAll();</script>2.Wrapping code blocks within
<pre><code> ... </code></pre>
in the HTML view of the composer
<pre><code> ... </code></pre>
in the HTML view of the composer
3.Example
public class Hello{
public static void main(String[] args){
System.out.println("Hello World!");
}
}