html make a box code example

Example 1: create box in html

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.box {
  height: 50px;
  width: 100px;
  background-color: #555;
}
</style>
</head>
<body>
<h2>Box CSS</h2>
<div class="box"></div>

</body>
</html>

Example 2: how do i make a boxin html

<div style="width:500px;height:100px;border:1px solid #000;">This is a rectangle!</div>

Example 3: how to style rule to apply the Border Box model css

header, ul, nav, li, a /* other elements */{

 display: block;
   -webkit-box-sizing: border-box;
   -moz-box-sizing: border-box;
   box-sizing: border-box;

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