Thanks for making this site. I have been wanting one like this for very very long. I am a backend engineer who has trouble understanding the CSS in practice(I have done the tutorials and made many practice questions., but none really clicked). If you have a pay button, I am willing to play (one time fee!)

Also, can you please enable email based signup. Just because I use your site should not mean I have to except Google/twitter/github privacy policy, spectrum sign up policy and what not. I want to work in the relative anonymity of the internet, not show my picture in random places.