External Link Icon - Add external link icon to Footer link(s)

[thekaveman]

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[angela-tran]

Apparently, only some properties can be styled for the :visited pseudo-class selector (see this CSS-tricks article). This means that we can't just specify the background-image to use for a visited link.

This issue is more obvious with the footer links since they are a elements as opposed to our modal triggers which are buttons styled as links.

Compare visited a vs. visited button

I found a StackOverflow post with some links to ways to hack around :visited, but maybe we should discuss with the design team on what to do.