#loader {
        border: 12px solid #f3f3f3;
        border-radius: 50%;
        border-top: 12px solid #444444;
        width: 70px;
        height: 70px;
        animation: spin 1s linear infinite;
    }
      
    @keyframes spin {
        100% {
            transform: rotate(360deg);
        }
    }
      
    .center {
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        margin: auto;
    }