Hello Repl.it! First off, I'll say that I love the new enhancements to the site! I've been using your system to perform interactive coding interviews for quite some time and I've really liked the experience that your site provides. It's a good mix of technical and high level that lets people get started with coding exercises quickly without the overhead of an IDE.
However you are now claiming, on your landing page, that the site works on all device types. I'm here to tell you that while you might be technically correct the user experience on mobile and tablet devices is so poor that the site is unusable and it makes you guys look bad that you claim "it works on mobile". A few quick points to help clarify, your reactive css is not reacting properly... login fields get hidden, css elements overlap each other, you press one button and another actually gets clicked because the sizing is all wonky. I'd really recommend either fixing your site and building a proper mobile experience or removing that section.
(mobile experience was tested on 3 different models of iphone and on 2 modern models of ipads. A number of us were trying to review the same code while on mobile devices and all of us encountered the same issues, some more prevelent on certain )