/* Spinner */
progress:not([value]) {
  background: url(img/spinner/default.png) no-repeat center center / 100% auto;
  animation: 0.9s rotate infinite steps(30);
  width: 2.9rem;
  height: 2.9rem;
  border: none;
  display: inline-block;
  vertical-align: middle;
}
progress:not([value])::-moz-progress-bar {
 background: none;
}
progress:not([value]).hidden {
  display: none;
}

/* Animations */
@keyframes rotate {
  from { transform: rotate(1deg); }
  to { transform: rotate(360deg); }
}

@keyframes move {
  from { background-position: 0 0; }
  to { background-position: 1rem 0; }
}