how to overlay a background over a background image in 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: make background overlay css

<div id="element-with-background-image">
   <div id="color-overlay"></div>
   ...
</div>