Description
Currently we use the following style for the copybutton:

This was chosen in order to match GitHub, a very common coding platform that we use for design inspiration. Since we chose our current image, GitHub has updated their copybutton to look like this:

Proposal
We should update our copybutton SVG to use this "copy icon" instead of the clipboard we currently use.
Guide to implement
I think the easiest thing will be to use the Tabler icon for copy: https://tablericons.com/