ng-mtab-api/spinner.less at master · fsieduc/ng-mtab-api · GitHub

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/**
 * http://lea.verou.me/2013/11/cleanest-css-spinner-ever/
 * (C)Leanest CSS spinner ever
 */

@keyframes spin {
  to { transform: rotate(1turn); }
}

.spinner {
  position: relative;
  display: inline-block;
  width: 5em;
  height: 5em;
  margin: 0 .5em;
  font-size: 1em;
  position:relative;
  top: .75em;
  text-indent: 999em;
  overflow: hidden;
  animation: spin 1s infinite steps(8);
}

.spinner.spinner-xs {
  font-size: .2em;
}

.spinner.spinner-sm {
  font-size: .5em;
}

.spinner.spinner-lg {
  font-size: 1em;
}

.spinner:before,
.spinner:after,
.spinner > div:before,
.spinner > div:after {
  content: '';
  position: absolute;
  top: 0;
  left: 2.25em; /* (container width - part width)/2  */
  width: .5em;
  height: 1.5em;
  border-radius: .2em;
  background: #eee;
  box-shadow: 0 3.5em #eee; /* container height - part height */
  transform-origin: 50% 2.5em; /* container height / 2 */
}

.spinner:before {
  background: #555;
}

.spinner:after {
  transform: rotate(-45deg);
  background: #777;
}

.spinner > div:before {
  transform: rotate(-90deg);
  background: #999;
}

.spinner > div:after {
  transform: rotate(-135deg);
  background: #bbb;
}