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HTML

              
                <div class="gradient">
  
</div>
              
            
!

CSS

              
                div {
  height: 100px;
  background-color: red;
  background-image:
    linear-gradient(
      to right, 
      #000000,
      #000000 1px,
      #ffff00 1px,
      #ffff00 100px,

      #000000 100px,
      #000000 101px,
      #ffff00 101px,
      #ffff00 200px,
      
      #000000 200px,
      #000000 201px,
      #ffff00 201px,
      #ffff00 300px,
      
      #000000 300px,
      #000000 301px,
      #ffff00 301px,
      #ffff00 400px,
      
      #000000 400px,
      #000000 401px,
      #ffff00 401px,
      #ffff00 500px,
      
      #000000 500px,
      #000000 501px,
      #ffff00 501px,
      #ffff00 600px,
      
      #000000 600px,
      #000000 601px,
      #ffff00 601px,
      #ffff00 700px,
      
      #000000 700px,
      #000000 701px,
      #ffff00 701px,
      #ffff00 800px,
      
      #000000 800px,
      #000000 801px,
      #ffff00 801px,
      #ffff00 900px,
      
      #000000 900px,
      #000000 901px,
      #ffff00 901px,
      #ffff00 1000px,
      
      #000000 1000px,
      #000000 1001px,
      #ffff00 1001px,
      #ffff00 1100px,
      
      #000000 1100px,
      #000000 1101px,
      #ffff00 1101px,
      #ffff00 1200px,
      
      #000000 1200px,
      #000000 1201px,
      #ffff00 1201px,
      #ffff00 1300px,
      
      #000000 1300px,
      #000000 1301px,
      #ffff00 1301px,
      #ffff00 1400px
    );
}
              
            
!

JS

              
                
              
            
!
999px
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