how to add code in html code example

Example 1: how to insert code in html

<pre>
  <code>
  &ld;code&gt;
  </code>
</pre>

Example 2: how to insert code in html

<pre><code>&lt;pre&gt;
  &lt;code&gt;
    p { color: red; }
    body { background-color: #eee; }
  &lt;/code&gt;
&lt;/pre&gt;</code></pre>