I’ve actually been enjoying teaching online during Covid-19. Besides the ability to have a soundtrack/theme (Between Two Ferns) and sound effects (applause and various boing noises from a midi keyboard), I’ve enjoyed using OBS Studio a lot. Below is a schematic diagram of the setup I use for teaching using OBS and Zoom Pro:

Abe's setup for OBS and Zoom

Here’s the splash screen with arcade classic font that’s made to look like Between Two Ferns (typo partially intentional) : Between Two Ferns