index.html

<!DOCTYPE html>
<html>
<head>
	<title>loadingSquare</title>

	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale = 1.0, user-scalable=no" />

	<link rel="stylesheet" type="text/css" href="style.css">
	<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>

	<script type="text/javascript">	
	$(function() {
	  $(".all").delay(5000).fadeOut();
	});
	</script>
</head>
<body>

<div class="all">
	<div class="block">
		<div class="square"></div>
		<div class="square"></div>
		<div class="square"></div>
		<div class="square"></div>

		<div class="square"></div>
		<div class="square"></div>
		<div class="square"></div>
		<div class="square"></div>
	</div>
</div>

</body>
</html>