Reply To: Change the background colors of the dropdown menu

There are a couple of errors in your code, missing letter r from background and there should be a space before !important.

Either of these should work (no need to use ‘!important’ in this case)

#primary-menu ul{
background-color: #7f7f7f;
}

or

#primary-menu ul{
background: #7f7f7f;
}