set background image with color with opecity css

1body::before{
2    content: "";
3    position: absolute;
4    top: 0;
5    right: 0;
6    bottom: 0;
7    left: 0;
8    z-index: -1;
9    background-image: url(image.jpg); /*Put your image url*/
10    background-size: cover;
11    background-position: center;
12    opacity: 0.25; /*Value from 0.0 to 1.0*/
13}

1/* Two ways to make images opaque */
2
3div {
4	background-color : rgba(120, 120, 120, 0.5) 
5   	/* the 0.5 is the value of opacity on a scale of 0-1 */
6}
7
8/* OR */
9
10div {
11	background-color : blue
12    opacity : 50%
13}

1div {
2  width: 200px;
3  height: 200px;
4  display: block;
5  position: relative;
6}
7
8div::after {
9  content: "";
10  background: url(image.jpg);
11  opacity: 0.5;
12  top: 0;
13  left: 0;
14  bottom: 0;
15  right: 0;
16  position: absolute;
17  z-index: -1;   
18}

1div {
2    opacity : 50%;
3}
4
5/* Use opacity to change the opacity of selected css */