The website uses the default themes for the app which I picked specifically to be easy to look at (I have it open all day).
According to WebAIM[0] it passes so feel free to rip the theme [1] and use it for your next project!
[0] https://webaim.org/resources/contrastchecker/
[1] https://github.com/cvburgess/dexter-www/blob/main/src/index....