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<!DOCTYPE html>
<html>
<head>
<style>
#grad1 {
  height: 200px;
  width: 200px;
  background-color: red; /* For browsers that do not support gradients */
  background-image: conic-gradient(red 0deg, red 90deg, yellow 90deg, yellow 180deg, green 180deg, green 270deg, blue 270deg);
  border-radius: 50%;
}
</style>
</head>
<body>
<h1>Conic Gradient - Pie Chart</h1>
<div id="grad1"></div>
</body>
</html>