Multiple Screenshares: Left/Right Button not visible #3483
Description
Steps to reproduce
Start multiple screen shares in a room.
Outcome
The buttons for switching between screen shares aren't visible since 0.15.0.
They still work, they're just invisible. Happens on embedded and SPA.
The buttons should be visible in this situation, the first image is missing the "right" button, the second image is missing the "left" button.
