.loading {
    position: fixed;
    z-index: 1999;
    height: 2em;
    width: 2em;
    overflow: show;
    margin: auto;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
}

    .loading:before {
        content: '';
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background-color: grey;
        opacity: 0.8;
    }

.spinner {
    margin: 100px auto 0;
    width: 100px;
    text-align: center;
}

    .spinner > div {
        width: 28px;
        height: 28px;
        background-color: #333;
        border-radius: 100%;
        display: inline-block;
        -webkit-animation: sk-bouncedelay 1.4s infinite ease-in-out both;
        animation: sk-bouncedelay 1.4s infinite ease-in-out both;
    }

    .spinner .bounce1 {
        -webkit-animation-delay: -0.32s;
        animation-delay: -0.32s;
    }

    .spinner .bounce2 {
        -webkit-animation-delay: -0.16s;
        animation-delay: -0.16s;
    }

@-webkit-keyframes sk-bouncedelay {
    0%, 80%, 100% {
        -webkit-transform: scale(0);
    }

    40% {
        -webkit-transform: scale(1.0);
    }
}

@keyframes sk-bouncedelay {
    0%, 80%, 100% {
        -webkit-transform: scale(0);
        transform: scale(0);
    }

    40% {
        -webkit-transform: scale(1.0);
        transform: scale(1.0);
    }
}