.lds-dual-ring.hidden {
    display: none;
}

.lds-dual-ring {
    display: inline-block;
    width: 80px;
    height: 80px;
}

    .lds-dual-ring:after {
        content: " ";
        display: block;
        width: 64px;
        height: 64px;
        margin: 5% auto;
        border-radius: 50%;
        border: 6px solid #fff;
        border-color: #fff transparent #fff transparent;
        animation: lds-dual-ring 1.2s linear infinite;
    }

@keyframes lds-dual-ring {
    0% {
        transform: rotate(0deg);
    }

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


.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(0,0,0,.8);
    z-index: 999;
    opacity: 1;
    transition: all 0.5s;
}