app.twitch.tv not loading correctly in vivaldi

[Jenoki]

The twitch chat app (app.twitch.tv) is not loading correctly in vivaldi.
It looks like this:

It's supposed to look like this:

I'm using vivaldi 1.10.834.9 (Official Build) (64-bit) on Windows 10 64bit

[bugmenot]

Yep, it's broken since February...