/* Absolute Center Spinner */
    .loading {
      position: fixed;
      z-index: 999;
      height: 2em;
      width: 2em;
      overflow: visible;
      margin: auto;
      top: 0;
      left: 0;
      bottom: 0;
      right: 0;
    }

    /* Transparent Overlay */
    .loading:before {
      content: '';
      display: block;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: rgba(118,118,118,0.3);
    }

    /* :not(:required) hides these rules from IE9 and below */
    .loading:not(:required) {
      /* hide "loading..." text */
      font: 0/0 a;
      color: transparent;
      text-shadow: none;
      background-color: transparent;
      border: 0;
    }

    .loading:not(:required):after {
      content: '';
      display: block;
      font-size: 10px;
      width: 1em;
      height: 1em;
      margin-top: -0.5em;
      -webkit-animation: spinner 1500ms infinite linear;
      -moz-animation: spinner 1500ms infinite linear;
      -ms-animation: spinner 1500ms infinite linear;
      -o-animation: spinner 1500ms infinite linear;
      animation: spinner 1500ms infinite linear;
      border-radius: 0.5em;
      -webkit-box-shadow: rgba(255, 0, 0, 0.75) 1.5em 0 0 0, rgba(255, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(255, 0, 0, 0.75) 0 1.5em 0 0, rgba(255, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(255, 0, 0, 0.5) -1.5em 0 0 0, rgba(255, 0, 0, 0.5) -1.1em -1.1em 0 0, rgba(255, 0, 0, 0.75) 0 -1.5em 0 0, rgba(255, 0, 0, 0.75) 1.1em -1.1em 0 0;
      box-shadow: rgba(255, 0, 0, 0.75) 1.5em 0 0 0, rgba(255, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(255, 0, 0, 0.75) 0 1.5em 0 0, rgba(255, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(255, 0, 0, 0.75) -1.5em 0 0 0, rgba(255, 0, 0, 0.75) -1.1em -1.1em 0 0, rgba(255, 0, 0, 0.75) 0 -1.5em 0 0, rgba(255, 0, 0, 0.75) 1.1em -1.1em 0 0;
    }

    /* Animation */

    @-webkit-keyframes spinner {
      0% {
        -webkit-transform: rotate(0deg);
        -moz-transform: rotate(0deg);
        -ms-transform: rotate(0deg);
        -o-transform: rotate(0deg);
        transform: rotate(0deg);
      }
      100% {
        -webkit-transform: rotate(360deg);
        -moz-transform: rotate(360deg);
        -ms-transform: rotate(360deg);
        -o-transform: rotate(360deg);
        transform: rotate(360deg);
      }
    }
    @-moz-keyframes spinner {
      0% {
        -webkit-transform: rotate(0deg);
        -moz-transform: rotate(0deg);
        -ms-transform: rotate(0deg);
        -o-transform: rotate(0deg);
        transform: rotate(0deg);
      }
      100% {
        -webkit-transform: rotate(360deg);
        -moz-transform: rotate(360deg);
        -ms-transform: rotate(360deg);
        -o-transform: rotate(360deg);
        transform: rotate(360deg);
      }
    }
    @-o-keyframes spinner {
      0% {
        -webkit-transform: rotate(0deg);
        -moz-transform: rotate(0deg);
        -ms-transform: rotate(0deg);
        -o-transform: rotate(0deg);
        transform: rotate(0deg);
      }
      100% {
        -webkit-transform: rotate(360deg);
        -moz-transform: rotate(360deg);
        -ms-transform: rotate(360deg);
        -o-transform: rotate(360deg);
        transform: rotate(360deg);
      }
    }
    @keyframes spinner {
      0% {
        -webkit-transform: rotate(0deg);
        -moz-transform: rotate(0deg);
        -ms-transform: rotate(0deg);
        -o-transform: rotate(0deg);
        transform: rotate(0deg);
      }
      100% {
        -webkit-transform: rotate(360deg);
        -moz-transform: rotate(360deg);
        -ms-transform: rotate(360deg);
        -o-transform: rotate(360deg);
        transform: rotate(360deg);
      }
    }