Katacoda bugs

[christiemolloy]

Current Katacoda bugs (feedback left by anonymous user):

@gsoria are you aware of any of these issues:

"The Katacoda UI has a lot of bugs (tested on Firefox 72.0.1 on Fedora 31), like broken scollbars (can't use them with the mouse), broken code window scrolling (can't go to the end, have to copy back and forth to/from an editor), and I had a situation where the rendered window was completely blank. A little reloading and wiggling got it back."