<!DOCTYPE html> 
<html> 
<head> 
<style type="text/css" media="screen"> 
    body { overflow: hidden; }

    .box {
      display: inline-block;
      height: 120px;
      width: 201px;
      margin: 10px;
      border: 1px solid black;
      background-repeat: no-repeat;
    }
   
    .gradientAngle0 {
        background-image: linear-gradient(0deg, white, black);
    }
   
    .gradientAngle90 {
        background-image: linear-gradient(90deg, white, black);
    }

    .gradientAngle180 {
        background-image: linear-gradient(180deg, white, black);
    }
   
    .gradientAngle270 {
        background-image: linear-gradient(270deg, white, black);
    }
    
    .gradientAngleMinus0 {
        background-image: linear-gradient(-0deg, white, black);
    }
    
    .gradientAngleMinus90 {
        background-image: linear-gradient(-90deg, white, black);
    }

    .gradientAngleMinus180 {
        background-image: linear-gradient(-180deg, white, black);
    }
   
    .gradientAngleMinus270 {
        background-image: linear-gradient(-270deg, white, black);
    }
   
    .gradientAngle360 {
        background-image: linear-gradient(360deg, white, black);
    }
   
    .gradientAngle450 {
        background-image: linear-gradient(450deg, white, black);
    }

    .gradientAngle540 {
        background-image: linear-gradient(540deg, white, black);
    }
   
    .gradientAngle630 {
        background-image: linear-gradient(630deg, white, black);
    }
</style> 
</head> 
<body> 
  <div class="box gradientAngle0"></div> 
  <div class="box gradientAngleMinus0"></div>
  <div class="box gradientAngle360"></div>
  <br/>
  <div class="box gradientAngle90"></div> 
  <div class="box gradientAngleMinus270"></div> 
  <div class="box gradientAngle450"></div>
  <br/>
  <div class="box gradientAngle180"></div> 
  <div class="box gradientAngleMinus180"></div> 
  <div class="box gradientAngle540"></div>
  <br/>
  <div class="box gradientAngle270"></div> 
  <div class="box gradientAngleMinus90"></div> 
  <div class="box gradientAngle630"></div>
</body> 
</html>