I have added a background image like it was told in 8.1. and I clicked on "run". The exercise 8.1. was marked as correct, but somehow the exercise 8.2. was skipped and it was marked as correct too.
So I didn't even had to insert this code line : background-size: cover;
I think it is a bug. Did anyone had this problem too?
padding: 250px 0;
font-family: 'Trebuchet MS', Helvetica, sans-serif;