From http://lea.verou.me/2013/11/cleanest-css-spinner-ever/

Xiao-Hu Tai
2013-12-06T19:56:00Z

cleanest-css-spinner-ever.css

| /**
| * (C)Leanest CSS spinner ever
| */
|
| @keyframes spin {
| to { transform: rotate(1turn); }
| }
|
| .progress {
| position: relative;
| display: inline-block;
| width: 5em;
| height: 5em;
| margin: 0 .5em;
| font-size: 12px;
| text-indent: 999em;
| overflow: hidden;
| animation: spin 1s infinite steps(8);
| }
|
| .small.progress {
| font-size: 6px;
| }
|
| .large.progress {
| font-size: 24px;
| }
|
| .progress:before,
| .progress:after,
| .progress > div:before,
| .progress > 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 */
| }
|
| .progress:before {
| background: #555;
| }
|
| .progress:after {
| transform: rotate(-45deg);
| background: #777;
| }
|
| .progress > div:before {
| transform: rotate(-90deg);
| background: #999;
| }
|
| .progress > div:after {
| transform: rotate(-135deg);
| background: #bbb;
| }