#overlay {
    background: #f7f7f7;
    color: #666666;
    position: fixed;
    height: 100%;
    width: 100%;
    z-index: 5000;
    top: 0;
    left: 0;
    float: left;
    text-align: center;
    padding-top: 25%;
    opacity: .90;
}


.spinner {
    margin: 0 auto;
    height: 64px;
    width: 64px;
    animation: rotate 0.8s infinite linear;
    border: 5px solid firebrick;
    border-right-color: transparent;
    border-radius: 50%;
}

@keyframes rotate {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}