Simple preloader jQuery script and CSS for web page layout.

loading.js

$(document).ready(function() {
  
  // Preloading 
	var div_box = "<div id='load-screen'><div id='loading'></div></div>";

	$("body").prepend(div_box);

	$('#load-screen').delay(700).fadeOut(600, function(){
		$(this).remove();
	});

});

style.css

#load-screen {
	background: url(../images/header-back.png);
	position: fixed;
	z-index: 10000;
	top: 0;
	width: 100%;
	height: 1600px;
}

#loading {
	width: 500px;
	height: 500px;
	margin: 10% auto;
	background: url(../images/loader.gif);
	background-size: 40%;
	background-repeat: no-repeat;
	background-position: center;
	z-index: 1;
}