<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.box1 {
width: 0px;
height: 0px;
/* border: 10px solid pink; */
border-top: 100px solid pink;
border-bottom: 100px solid red;
border-right: 100px solid green;
border-left: 100px solid blue;
}
.box2 {
width: 0px;
height: 0px;
border: 100px solid transparent;
border-top-color: pink;
margin: 100px auto;
}
</style>
</head>
<body>
<div class="box1"></div>
<div class="box2"></div>
</body>
</html>
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