#loading_container{
    display: none;
    background-color: rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    z-index: 1050;
    pointer-events: auto;
}
#loading{
    top: 50%;
    left: 50%;
    width:30em;
    height:18em;
    margin-top: -9em; /*set to a negative number 1/2 of your height*/
    margin-left: -15em; /*set to a negative number 1/2 of your width*/
    position:absolute;
}
.sk-wave {
    margin: 40px auto;
    width: 50px;
    height: 40px;
    text-align: center;
    font-size: 10px; }
.sk-wave .sk-rect {
    background-color: #333;
    height: 100%;
    width: 6px;
    display: inline-block;
    -webkit-animation: sk-waveStretchDelay 1.2s infinite ease-in-out;
    animation: sk-waveStretchDelay 1.2s infinite ease-in-out; }
.sk-wave .sk-rect1 {
    -webkit-animation-delay: -1.2s;
    animation-delay: -1.2s; }
.sk-wave .sk-rect2 {
    -webkit-animation-delay: -1.1s;
    animation-delay: -1.1s; }
.sk-wave .sk-rect3 {
    -webkit-animation-delay: -1s;
    animation-delay: -1s; }
.sk-wave .sk-rect4 {
    -webkit-animation-delay: -0.9s;
    animation-delay: -0.9s; }
.sk-wave .sk-rect5 {
    -webkit-animation-delay: -0.8s;
    animation-delay: -0.8s; }

@-webkit-keyframes sk-waveStretchDelay {
    0%, 40%, 100% {
        -webkit-transform: scaleY(0.4);
        transform: scaleY(0.4); }
    20% {
        -webkit-transform: scaleY(1);
        transform: scaleY(1); } }

@keyframes sk-waveStretchDelay {
    0%, 40%, 100% {
        -webkit-transform: scaleY(0.4);
        transform: scaleY(0.4); }
    20% {
        -webkit-transform: scaleY(1);
        transform: scaleY(1); } }