Dark mode support

[ptoews]

Sadly, the app is not fully usable for me because I'm using dark mode on Ubuntu 20.04 and some of the text is not readable. Here are some examples:

The text on the gradient and the table are not readable. I don't know if there's more I'm missing.

Project title is too small as well, but that is a different issue.

[SoftwareSchlosser]

Same for me. It's hard to use it like this.