Bootstrap Snippets, Bootstrap 3 Page Loading

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Bootstrap 3 Page Loading</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script type="text/javascript" src="https://code.jquery.com/jquery-3.2.1.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<style type="text/css">
#loading {
    background: #f4f4f2 url("img/page-bg.png") repeat scroll 0 0;
    height: 100%;
    left: 0;
    margin: auto;
    position: fixed;
    top: 0;
    width: 100%;
}
.ftl {
    border: 0.01em solid rgba(150, 150, 150, 0.1);
    border-radius: 50%;
    font-size: 100px;
    height: 1em;
    list-style: outside none none;
    margin: 0 auto;
    position: relative;
    top: 35%;
    width: 1em;
    z-index: 2147483647;
}
.ftl li {
    border-radius: 50%;
    height: 0.2em;
    position: absolute;
    width: 0.2em;
}
.ftl li:nth-child(1) {
    animation: 1.13s linear 0s normal none infinite running rota, 3.67s ease-in-out 0s alternate none infinite running opa;
    background: #00c176 none repeat scroll 0 0;
    left: 50%;
    margin: 0 0 0 -0.1em;
    top: 0;
    transform-origin: 50% 250% 0;
}
.ftl li:nth-child(2) {
    animation: 1.86s linear 0s normal none infinite running rota, 4.29s ease-in-out 0s alternate none infinite running opa;
    background: #ff003c none repeat scroll 0 0;
    margin: -0.1em 0 0;
    right: 0;
    top: 50%;
    transform-origin: -150% 50% 0;
}
.ftl li:nth-child(3) {
    animation: 1.45s linear 0s normal none infinite running rota, 5.12s ease-in-out 0s alternate none infinite running opa;
    background: #fabe28 none repeat scroll 0 0;
    bottom: 0;
    left: 50%;
    margin: 0 0 0 -0.1em;
    transform-origin: 50% -150% 0;
}
.ftl li:nth-child(4) {
    animation: 1.72s linear 0s normal none infinite running rota, 5.25s ease-in-out 0s alternate none infinite running opa;
    background: #88c100 none repeat scroll 0 0;
    margin: -0.1em 0 0;
    top: 50%;
    transform-origin: 250% 50% 0;
}
@keyframes opa {
12% {
    opacity: 0.8;
}
19.5% {
    opacity: 0.88;
}
37.2% {
    opacity: 0.64;
}
40.5% {
    opacity: 0.52;
}
52.7% {
    opacity: 0.69;
}
60.2% {
    opacity: 0.6;
}
66.6% {
    opacity: 0.52;
}
70% {
    opacity: 0.63;
}
79.9% {
    opacity: 0.6;
}
84.2% {
    opacity: 0.75;
}
91% {
    opacity: 0.87;
}
}

@keyframes rota {
100% {
    transform: rotate(360deg);
}
}

}
</style>
  
<div class="container">
	<div class="row">
		<h2>Bootstrap 3 Page Loading</h2>
            <div id="loading">
                <ul class="ftl">
                    <li></li>
                    <li></li>
                    <li></li>
                </ul>
            </div>
	</div>
</div>

</body>
</html>