The Stumble button was hidden at my screensize which was a little confusing :-). Looks like removing `.wholePageContainer{height: 100vh;}` fixes the issue and keeps the buttons from stacking on top of each other.
Hmm, that's troubling. What browser and OS are you using? Having read your comments I realized I haven't tested it on high zoom in safari (or at all on Internet Explorer or Edge).
Safari on Mac, for example at 950x950, shows them stacking. Looks like Firefox on Mac is ok.
Interesting. Thanks for letting me know about this. I'll get it fixed this evening.
Sure thing and thanks for bringing back good StumbleUpon memories!