The :not(selector) selector matches every element that is NOT the specified element/selector.

:not(selector) {
    css declarations;
}
:not(li) {
   color: #3366ff;
   background: #ffff99;
}

Click the button below to experiment with this selector.

Give it a Try!

3.5Firefox 9.0Explorer 4.0Chrome 3.2Safari 9,6Opera