/* Absolute Center Spinner */
        .loading {
          position: fixed;
          z-index: 999;
          height: 2em;
          width: 2em;
          overflow: show;
          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: radial-gradient(rgba(20, 20, 20,.8), rgba(0, 0, 0, .8));

          background: -webkit-radial-gradient(rgba(20, 20, 20,.8), rgba(0, 0, 0,.8));
        }

        /* :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 150ms infinite linear;
          -moz-animation: spinner 150ms infinite linear;
          -ms-animation: spinner 150ms infinite linear;
          -o-animation: spinner 150ms infinite linear;
          animation: spinner 150ms infinite linear;
          border-radius: 0.5em;
          -webkit-box-shadow: rgba(255,255,255, 0.75) 1.5em 0 0 0, rgba(255,255,255, 0.75) 1.1em 1.1em 0 0, rgba(255,255,255, 0.75) 0 1.5em 0 0, rgba(255,255,255, 0.75) -1.1em 1.1em 0 0, rgba(255,255,255, 0.75) -1.5em 0 0 0, rgba(255,255,255, 0.75) -1.1em -1.1em 0 0, rgba(255,255,255, 0.75) 0 -1.5em 0 0, rgba(255,255,255, 0.75) 1.1em -1.1em 0 0;
        box-shadow: rgba(255,255,255, 0.75) 1.5em 0 0 0, rgba(255,255,255, 0.75) 1.1em 1.1em 0 0, rgba(255,255,255, 0.75) 0 1.5em 0 0, rgba(255,255,255, 0.75) -1.1em 1.1em 0 0, rgba(255,255,255, 0.75) -1.5em 0 0 0, rgba(255,255,255, 0.75) -1.1em -1.1em 0 0, rgba(255,255,255, 0.75) 0 -1.5em 0 0, rgba(255,255,255, 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);
          }
        }