<html>
<head>
<style>
div {
height: 50px;
width: 50px;
background-color: blue;
}
</style>
</head>
<body>
<div id="box"></div>
</body>
</html>
<html>
<head>
<style>
div {
height: 50px;
width: 50px;
background-color: blue;
}
</style>
</head>
<body>
<div id="box"></div>
</body>
</html>