background image and overlay css code example

Example 1: background overlay css

html {
  min-height:100%;
  background:linear-gradient(0deg, rgba(255, 0, 150, 0.3), rgba(255, 0, 150, 0.3)), url(http://lorempixel.com/800/600/nature/2);
  background-size:cover;
}

Example 2: css background overlay

.image:before{
    content: "";
        background: rgba(0,0,0,.6);
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 24px;
}