#loading_mask {
    position: fixed;
    top: 0%;
    left: 50%;
    margin: 0;
    background-color: rgba(80, 80, 80, 0.3);
}

#loading_mask .loading_bar {
    display: inline-block;
    width: 26px;
    height: 26px;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -13px;
    margin-top: -13px;
    z-index: 10;
    border-radius: 50%;
    -webkit-animation: loading_bar_spin 0.5s linear infinite;
    animation: loading_bar_spin 0.5s linear infinite;
    border: 2px solid #7d51ff;
    border-bottom: 2px solid #fff;
}
@-ms-keyframes loading_bar_spin {
    from {
        -ms-transform: rotate(0deg);
    }
    to {
        -ms-transform: rotate(360deg);
    }
  }
  @-moz-keyframes loading_bar_spin {
    from {
        -moz-transform: rotate(0deg);
    }
    to {
        -moz-transform: rotate(360deg);
    }
  }
  @-webkit-keyframes loading_bar_spin {
    from {
        -webkit-transform: rotate(0deg);
    }
    to {
        -webkit-transform: rotate(360deg);
    }
  }
  @keyframes loading_bar_spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
  }