<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="style.css">
<title>BOX!!</title>
</head>
<body>
<div>box </div>
</body>
</html>
div{
width: 100%;
height: 30px;
background-color: skyblue;
}
This Pen doesn't use any external CSS resources.
This Pen doesn't use any external JavaScript resources.