body {
  background-color: #F5F5F5;
  color: #555;
  font-size: 1.1em;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

hr {
  margin: 50px 0;
}

.container {
  margin: 50px auto;
  max-width: 700px;
  padding: 10px;
  border: 1px solid #aaa;
  background-color: white;
}

.element {
  width: 50px;
  height: 50px;
  left: 0;
  background-color: #009966;
  position: relative;
  -webkit-transform-origin: left center;
  -ms-transform-origin: left center;
  transform-origin: left center;
}

.container:hover .element {
  -webkit-animation-name: wobble;
  animation-name: wobble;
}

.element-1 {
  background-color: #009966;
  -webkit-animation-duration: 2s;
  animation-duration: 2s;
}

.element-2 {
  background-color: purple;
  -webkit-animation-duration: 4s;
  animation-duration: 4s;
}

.element-3 {
  background-color: orange;
  -webkit-animation-duration: 6s;
  animation-duration: 6s;
}

@-webkit-keyframes wobble {
  0% {
    left: 0px;
  }
  10% {
    left: 50px;
  }
  20% {
    left: 25px;
  }
  30% {
    left: 100px;
  }
  40% {
    left: 50px;
  }
  50% {
    left: 200px;
  }
  60% {
    left: 100px;
  }
  70% {
    left: 250px;
  }
  80% {
    left: 200px;
  }
  90% {
    left: 300px;
  }
  100% {
    left: 0px;
  }
}

@keyframes wobble {
  0% {
    left: 0px;
  }
  10% {
    left: 50px;
  }
  20% {
    left: 25px;
  }
  30% {
    left: 100px;
  }
  40% {
    left: 50px;
  }
  50% {
    left: 200px;
  }
  60% {
    left: 100px;
  }
  70% {
    left: 250px;
  }
  80% {
    left: 200px;
  }
  90% {
    left: 300px;
  }
  100% {
    left: 0px;
  }
}