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

.cart-subscribe-loading-spinner {
  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);
}


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


.cart-subscribe-loading-spinner:before {
  background: #555;
}

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

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

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