#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: #3498db;
    -webkit-animation: spin 2s linear infinite;
    animation: spin 2s linear infinite;
    z-index: 1001;
}

    #loader:before {
        content: "";
        position: absolute;
        top: 5px;
        left: 5px;
        right: 5px;
        bottom: 5px;
        border-radius: 50%;
        border: 3px solid transparent;
        border-top-color: #e74c3c;
        -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: #f9c922;
        -webkit-animation: spin 1.5s linear infinite;
        animation: spin 1.5s linear infinite;
    }

@keyframes loading {
    from {
        transform: rotate(0turn);
    }
    to {
        transform: rotate(1turn);
    }
}