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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<div class="box"></div>
</body>
</html>
 
.box {
  background-color: red;
}
 
var number = prompt("number");
var box = document.querySelector(".box");
box.style.height = number + "px";
box.style.width = number + "px";
Output

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anonymouspro
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