background image with opacity css in a tag code example

Example 1: background-image: url opacity

background-image: url(IMAGE_URL); /* fallback for older browsers */

background-image: linear-gradient(to bottom, rgba(0,0,0,0.6) 0%,rgba(0,0,0,0.6) 100%), url(IMAGE_URL);

Example 2: set background image opacity

#bg{
background-image: url('images/wood1.jpg');
opacity:0.2;
width:300px;
height:300px;
}

Example 3: background image opacity css

body::before{
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: -1;
    background-image: url(image.jpg); /*Put your image url*/
    background-size: cover;
    background-position: center;
    opacity: 0.25; /*Value from 0.0 to 1.0*/
}

Example 4: Background image opacity CSS

div {
    opacity : 50%;
}

/* Use opacity to change the opacity of selected css */