#loader {
    width: 100%;
    height: 100%;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 9999;
    background: rgba(255, 255, 255, 0.6);
    display: none;
}

#loader img {
    width: 40px;
    height: 40px;
    position: absolute;
    top: 50%;
    right: 50%;
    margin-top: -20px;
    margin-left: -20px;
}