Mouse Wheel Animation CSS Icon | http://jsfiddle.net/cmajo9h6/

mousewheel-icon.html

<style>
/* ---------------------------------------------- /*
 * Mouse animate icon
/* ---------------------------------------------- */
.mouse-icon {
  border: 2px solid #000;
  border-radius: 16px;
  height: 40px;
  width: 24px;
  display: block;
  z-index: 10;
  opacity: 0.7;
}
.mouse-icon .wheel {
  -webkit-animation-name: drop;
  -webkit-animation-duration: 1s;
  -webkit-animation-timing-function: linear;
  -webkit-animation-delay: 0s;
  -webkit-animation-iteration-count: infinite;
  -webkit-animation-play-state: running;
  -webkit-animation-name: drop;
          animation-name: drop;
  -webkit-animation-duration: 1s;
          animation-duration: 1s;
  -webkit-animation-timing-function: linear;
          animation-timing-function: linear;
  -webkit-animation-delay: 0s;
          animation-delay: 0s;
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
  -webkit-animation-play-state: running;
          animation-play-state: running;
}
.mouse-icon .wheel {
  position: relative;
  border-radius: 10px;
  background: #000;
  width: 2px;
  height: 6px;
  top: 4px;
  margin-left: auto;
  margin-right: auto;
}
@-webkit-keyframes drop {
  0% {
    top: 5px;
    opacity: 0;
  }
  30% {
    top: 10px;
    opacity: 1;
  }
  100% {
    top: 25px;
    opacity: 0;
  }
}
@keyframes drop {
  0% {
    top: 5px;
    opacity: 0;
  }
  30% {
    top: 10px;
    opacity: 1;
  }
  100% {
    top: 25px;
    opacity: 0;
  }
}
</style>

<div class="mouse-icon"><div class="wheel"></div></div>