Copy code button (server side)
The copy button is in the HTML file served.
Here lies a CSS code block sporting a copy button.
some-box { width: 20px; height: 20px; background: black; margin-bottom: 1.5rem; }
Here lies a HTML code block with a copy button. It overflows, the sticky header ensures the button is always visible.
<div>long text to show overflow and how you want to handle it</div>
Here lies a pre block that does not contain a code element. You can see it does not have a copy button, as expected! Huzzah!
This is a pre block without code.