Css negation pseudo-class, :not(X) can be used on any simple selector. It will match element which are not selected by selector X.
Example – css :not
Set background color of div which does not have class “box”.
<style type="text/css" media="screen">
div:not(.box) {
background-color:lightblue;
}
</style>
<div class="box">div1</div>
<div>div2</div>
