style to overlay background image in css code example

Example 1: background image overlay

html {
  background:url(http://lorempixel.com/800/600/nature/2);
  background-size:cover;
  box-shadow:inset 0 0 0 2000px rgba(255, 0, 150, 0.3);
}

Example 2: make background overlay css

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