#loader {
            border: 12px solid #f3f3f3;
            border-radius: 50%;
            border-top: 12px solid #444444;
            width: 70px;
            height: 70px;
            animation: spin 1s linear infinite;
        }
 
        .center {
        position:relative; 
        top:150;
            margin: auto;
            z-index:100000000000
        }
 
        @keyframes spin {
            100% {
                transform: rotate(360deg);
            }
        }