The dynamic content button sits behind the scrollbar here.

The dynamic content button sits behind the scrollbar here.

Confirmed. Thanks!
Quick update here: I’ve looked into this, and regretfully right now there isn’t much we can do since those are native scrollbars. There isn’t a straightforward way to position an element absolutely (like in the corner) while also detecting if a scrollbar is present. We can always push it over to the right, but it’s tricky to know when that should happen conditionally. I’m sure there’s a way to fix this, but it would be quite involved and take some detection of heights and scroll offsets changing. Most operating systems have them show only when scrolling nowadays. Considering this is the first we’ve seen it since the Dynamic Content release, I’m comfortable not making a change at this time. I do apologize if it is bothersome, but regretfully I’m not able to justify the time needed to fix it at the moment.
No worries. It’s a minor thing. Your time is better spent fixing other more important things 
Thanks for understanding! I wish it was a quick fix but sometimes those native browser elements can be hard to wrangle.