<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="loader text-center"> <span class="span"></span> </div>

.loader{ position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: 99999; transition: 1s; } .span{ position: absolute; transform: translate(-50%, 50%); width: 120px; height: 120px; top: 35%; border: 5px solid #262626; z-index: 1; animation: animar 2.5s linear infinite; } .span:before{ content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: #262626; animation: animarbg 2.5s linear infinite; } @keyframes animar { 0% { transform: translate(-50%, 50%) rotate(0deg); } 25% { transform: translate(-50%, 50%) rotate(180deg); } 50% { transform: translate(-50%, 50%) rotate(180deg); } 75% { transform: translate(-50%, 50%) rotate(360deg); } 100% { transform: translate(-50%, 50%) rotate(360deg); } } @keyframes animarbg { 0% { height: 0; } 25% { height: 0; } 50% { height: 100%; } 75% { height: 100%; } 100% { height: 0; } }