Is your feature request related to a problem? Please describe.
Dropping support for IE11 allows us to use more modern techniques. Using a more modern CSS reset could help reduce specificity and override issues.

Describe the solution you'd like
This CSS reset uses new techniques to unset and revert certain styles. It also uses :where(), which has a specificity of zero, so it wouldn't cause us issues later on.

https://elad2412.github.io/the-new-css-reset/

Describe alternatives you've considered
There are alternative resets, but I think the above is short and effective.

Additional context
Related to #4698