POWER!
<!DOCTYPE html>
<html>
<head>
<title>Dark Page</title>
<style>
body {
background-color: black;
}
.power {
color: red;
font-size: 10em;
position: fixed;
bottom: 0;
left: 50%;
transform: translateX(-50%);
display: none;
}
</style>
<script>
setTimeout(function() {
document.querySelector(".power").style.display = "block";
}, 5000);
</script>
</head>
<body>
<div class="power">POWER!</div>
</body>
</html>