.icon-a::before {
    display: inline-block;
    margin-right: .5em;
    font: normal normal normal 14px/1 NucleoIcons;
    font-size: inherit;
    text-rendering: auto;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transform: translate(0, 0);
}
div#loading {
    display: none;
    position: fixed;
    top: 0;
    width: 100%;
    height: 100%;
    margin: auto;
    background-color: rgba(0, 0, 0, 0.29);
    color: white;
    z-index: 9999;
    text-align: center;
    right: 0;
    left: 0;
}
#loading > div {
    position: fixed;
    top: 45%;
    text-align: center;
    width: 100%;
}
.lds-facebook {
    display: inline-block;
    position: relative;
    width: 64px;
    height: 64px;
}

    .lds-facebook div {
        display: inline-block;
        position: absolute;
        left: 6px;
        width: 13px;
        background: #fff;
        animation: lds-facebook 1.2s cubic-bezier(0, 0.5, 0.5, 1) infinite;
    }

        .lds-facebook div:nth-child(1) {
            left: 6px;
            animation-delay: -0.24s;
        }

        .lds-facebook div:nth-child(2) {
            left: 26px;
            animation-delay: -0.12s;
        }

        .lds-facebook div:nth-child(3) {
            left: 45px;
            animation-delay: 0;
        }

@keyframes lds-facebook {
    0% {
        top: 6px;
        height: 51px;
    }

    50%, 100% {
        top: 19px;
        height: 26px;
    }
}