html making the background image less opaque 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: Background image opacity CSS

div {
    opacity : 50%;
}

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