@media quarry max-width

I am having a small problem that I am sure is probably easy for others but not for me.

Step 27

Now you need to make it responsive. Add a @media query with a max-width of 768px.

my answer: @media only screen and (max-width: 768px)
(I have also tried doing the min-width with my answer. For some reason I am stumped.) Any help would be great. Thanks ahead of time.

Why do you think you need screen here?