CODE EXAMPLE FOR CSS

use dark shed in image in css

#background { 
 background: rgba(0, 0, 0, 0.7) url('https://loremflickr.com/320/240');
 height: 100%;
 background-position: center;
 background-repeat: no-repeat;
 background-size: cover;
 background-blend-mode: darken;
}