<html> <style> html, body { height: 100%; margin: 0; padding: 0; width: 100%; } body { display: table; background-color: #000000; } .my-block { text-align: center; display: table-cell; vertical-align: middle; } .orange { color: orange; } </style> </head> <body> <embed src="shutdown.mp3" width="0" height="0" loop="false" autostart="true" hidden="true" /> <div class="my-block orange"> It's now safe to turn off<br /> your browser </div> </body> </html>