Clock icon animated #css3

.clock-icon {
  content: '';
  width: 2em;
  height: 2em;
  border: .5em solid black;
  display: inline-block;
  border-radius: 2em;
  position: relative;
}

// hours
.clock-icon:after {
  content: '';
  position: absolute;
  top: .75em;
  left: 1em;
  width: 1em;
  height: .5em;
  background: black;
  display: inline-block;
  border-radius: 1em;
  transform-origin: 0 0.25em;
  animation: roll 12s infinite linear;
  z-index: 2;
  box-shadow: 0 0 .1em black;
}

// minutes
.clock-icon:before {
  content: '';
  position: absolute;
  top: .75em;
  left: 1em;
  width: .8em;
  height: .5em;
  background: black;
  display: inline-block;
  border-radius: 1em;
  transform-origin: 0 0.25em;
  animation: roll 1s infinite linear;
  z-index: 2;
  box-shadow: 0 0 .1em black;
}
@keyframes roll {   
  0% {transform: rotate(0);} 
  100% {transform: rotate(360deg);}
}