Help with a challenge question in CSS

Challenge question help. Not sure what I am doing wrong, but I am supposed to code for the following; Select the unordered list inside the nav element. Remove the margins on the top and bottom. Set the the margins on the left & right to 10px. I add the following code:

nav ul {
  list-style: none
  margin: 0 10px;
   }

Receive the error to be sure to set the top margin to 0. Any help would be greatly appreciated

EDIT: Press EDIT on your post and see what i did to achieve the highlights for the code, remember that you need to have an space between lines so it works . See the code above and you can also check this and heres another one , and fast and easy one Posting code etc.. instruction -Aurelian