Support for python 3.9 is urgently required

[dae]

The button to play sound is too big

According to Anki Beta Builds Documentation, beta builds now can be installed via pip. I just tried installing 2.1.37rc1 via pip on Linux(Xubuntu 20.04 LTS) and there was no problems. The default size of a replay button is currently 40px. Here is the relevant part of the source code: