This code located in guru's custom.css, works on other sites I have with the Educatsy templet.
background-color: rgba(0, 0, 0, 0.8);
As I understand, this code puts a dark background behind the lesson layout but in Sensei it doesn't work, so you lose the lesson interface as in the image.
I tried to fix it by changing the layout to dark but no change is shown.
What can i do?