CodePen

HTML

            
              <div class="wrapper">
  <div class="left"></div>
  <div class="right"></div>
</div>
            
          
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↑ Insert the most common viewport meta tag

CSS

            
              * {
  box-sizing:border-box;
}

.wrapper {
  width:960px;
  background:url("http://lorempixel.com/output/abstract-q-g-50-50-3.jpg");
  margin:10px auto;
  overflow:hidden;
}

.left,
.right {
  width:50%;
  float:left;
  min-height:250px;
}

.left {
  background-image: -webkit-radial-gradient(center, circle closest-side, rgba(255,255,255,0.2) 0%, rgba(0,0,0,0.8) 100%);
}



            
          
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JS

            
              
            
          
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