Emoji on leaderboard look clickable but are not

[klingerf]

It looks like we have the same styles applied to the emoji on the home page and the emoji on the leaderboard, such that hovering over a leaderboard emoji looks like this:

That gives the impression that the emoji is clickable, but clicking on an emoji on the leaderboard doesn't do anything. I think it would be better to remove the hover background color and pointer tooltip for the emoji on that page.