/* Absolute Center Spinner */
.loading {
  position: fixed;
  z-index: 999999;
  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);
  }
}