<!DOCTYPE html>
<!--
 | Setting 4 different color values, width values and radius values for the edges
 | of a rounded corners border.
 |   https://www.w3.org/TR/css3-background/#the-border-color
 |   https://www.w3.org/TR/css3-background/#the-border-width
 |   https://www.w3.org/TR/css3-background/#border-radius
 -->
<html>
<head>
  <style>
    div {
      border: solid;
      border-color: #00FFFF #FF7F50 #FF69B4 #FAFAD2;
      border-width: 10px 50px 30px 80px;
      border-radius: 30px 80px 100px 150px;
      height: 200px;
      width: 400px;
    }
  </style>
</head>
<body>
  <div></div>
</body>
</html>