div color overlay css

1box-shadow: inset 0 0 0 2000px rgb(0 0 0 / 67%);

1#hero{
2  background-image:url();
3  background-size:cover;
4  background-position:top center;
5  position:relative;
6}
7
8#hero::after{
9  content:'';
10  position:absolute;
11  left:0;
12  top:0;
13  height:100%;
14  width:100%;
15  background-color:black;
16  opacity:0.7;
17}