"preloader"
Bootstrap 4.0.0 Snippet by Shakibur22

<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div id="preloader"> <div id="loader"></div> </div>
body { background-color: #222; } #preloader { position: fixed; top: 0; left: 0; width: 100%; height: 100%; } #loader { display: block; position: relative; left: 50%; top: 50%; width: 150px; height: 150px; margin: -75px 0 0 -75px; border-radius: 50%; border: 3px solid transparent; border-top-color: #9370DB; -webkit-animation: spin 2s linear infinite; animation: spin 2s linear infinite; } #loader:before { content: ""; position: absolute; top: 5px; left: 5px; right: 5px; bottom: 5px; border-radius: 50%; border: 3px solid transparent; border-top-color: #BA55D3; -webkit-animation: spin 3s linear infinite; animation: spin 3s linear infinite; } #loader:after { content: ""; position: absolute; top: 15px; left: 15px; right: 15px; bottom: 15px; border-radius: 50%; border: 3px solid transparent; border-top-color: #FF00FF; -webkit-animation: spin 1.5s linear infinite; animation: spin 1.5s linear infinite; } @-webkit-keyframes spin { 0% { -webkit-transform: rotate(0deg); -ms-transform: rotate(0deg); transform: rotate(0deg); } 100% { -webkit-transform: rotate(360deg); -ms-transform: rotate(360deg); transform: rotate(360deg); } } @keyframes spin { 0% { -webkit-transform: rotate(0deg); -ms-transform: rotate(0deg); transform: rotate(0deg); } 100% { -webkit-transform: rotate(360deg); -ms-transform: rotate(360deg); transform: rotate(360deg); } }

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