The button looked just like regular text and it wasn't obvious that it
was an interactive element.
So we're styling it like the "Hide" link (which should actually be a
button, by the way).
Note buttons by default don't have a `cursor: pointer` property because
they're usually styled in a way that makes it obvious they're
interactive elements. Since that isn't the case here, we're adding that
extra hint for mouse users.
Also note all these links/buttons will look like regular text to color-
blind users. And if they use a touchscreen, they won't be able to hover
on them to see the cursor change. We might need to change these elements
in the future.
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