Run Example

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<style>

@media screen and (min-width: 740px) {
  body {
    background-color: lightblue;
  }
}
</style>
</head>
<body>

<h1>Resize the browser window to see the effect.</h1>
<p>The following example set the background color to lightblue if the screen size is 740 pixels wide or wider.</p>

</body>
</html>
Result: