Css background-image có opacity làm nền

Code box:
div {
width: 200px;
height: 200px;
display: block;
position: relative;
}
div::after {
content: “”;
background: url(image.jpg);
opacity: 0.5;
top: 0;
left: 0;
bottom: 0;
right: 0;
position: absolute;
z-index: -1;
}