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Few QoL improvements can be made:

Some trivial challenges(i.e. "Hello World!") get many, many answers, so the leaderboard should show a scrollbar beyond some point(after the first 10 submissions, maybe?). 

Another thing I'd like to see is the ability to hide the leaderboard, preferably by clicking the "leaderboards by language" thing(It looks clickable, but i can't click it grrr)