.hidden {
    display: none;    
}

#overlay{
    position: fixed;
    bottom:0;
    left:0;
    right:0;
    top:0;
    height: 100%;
    z-index: 1000000 !important;
    background: rgba(50,50,50,0.5); 
    overflow-y: hidden !important;
}

.lds-facebook {
    display: inline-block;
    position: relative;
    width: 80px;
    height: 80px;
    margin-top: 20%;
    margin-left: 45%;
}

.lds-facebook div {
    display: inline-block;
    position: absolute;
    left: 8px;
    width: 16px;
    background: #fff;
    animation: lds-facebook 1.2s cubic-bezier(0, 0.5, 0.5, 1) infinite;
}

.lds-facebook div:nth-child(1) {
    left: 8px;
    animation-delay: -0.24s;
}

.lds-facebook div:nth-child(2) {
    left: 32px;
    animation-delay: -0.12s;
}

.lds-facebook div:nth-child(3) {
    left: 56px;
    animation-delay: 0;
}

@keyframes lds-facebook {

    0% {
        top: 8px;
        height: 64px;
    }

    50%, 100% {
        top: 24px;
        height: 32px;
    }

}