<!DOCTYPE html>
<!--
 | Simple linear gradient with two adjacent color stops that share the same
 | color stop position (e.g. so it will transition from one color to another
 | instantly at that point).
 -->
<html>
<head>
  <style>
    div {
      background: linear-gradient(yellow, blue 40%, green 40%, yellow);
      width: 200px;
      height: 200px;
    }
  </style>
</head>
<body>
  <div></div>
</body>
</html>