<!DOCTYPE html>
<html lang="en-US">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
body{
color:red;
}
@media all {
body{
color:blue;
}
}
</style>
</head>
<body>
<h1>CSS @media all</h1>
<p>Body color will be blue at any size (device).</p>
</body>
</html>