/* Absolute Center Spinner */
.loading {
  position: fixed;  
  z-index: 999;
  height: 2em;
  width: 2em;
  overflow: show;
  display: none;
  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(0,0,0,0.3);  
}

/* :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(0, 0, 0, 0.75) 1.5em 0 0 0, rgba(0, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) 0 1.5em 0 0, rgba(0, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(0, 0, 0, 0.5) -1.5em 0 0 0, rgba(0, 0, 0, 0.5) -1.1em -1.1em 0 0, rgba(0, 0, 0, 0.75) 0 -1.5em 0 0, rgba(0, 0, 0, 0.75) 1.1em -1.1em 0 0;
  box-shadow: rgba(0, 0, 0, 0.75) 1.5em 0 0 0, rgba(0, 0, 0, 0.75) 1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) 0 1.5em 0 0, rgba(0, 0, 0, 0.75) -1.1em 1.1em 0 0, rgba(0, 0, 0, 0.75) -1.5em 0 0 0, rgba(0, 0, 0, 0.75) -1.1em -1.1em 0 0, rgba(0, 0, 0, 0.75) 0 -1.5em 0 0, rgba(0, 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);
    }
}