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;
  width: 90%;
  max-width: 700px;
  padding: 30px;
  border: 1px solid #aaa;
  background-color: white;
}

.element {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  position: relative;
  top: 0;
  left: 0;
}

.container:hover .element {
	-webkit-animation-name: zigzag;
  animation-name: zigzag;
  -webkit-animation-duration: 3s;
  animation-duration: 3s;
  -webkit-animation-iteration-count: 2;
  animation-iteration-count: 2;
  -webkit-animation-direction: alternate;
  animation-direction: alternate;
  -webkit-animation-timing-function: linear;
  animation-timing-function: linear;
}

.element-1 {
  background-color: #009966;
  -webkit-animation-delay: 0s;
  animation-delay: 0s;
}

.element-2 {
  background-color: purple;
  -webkit-animation-delay: 1s;
  animation-delay: 1s;
}

.element-3 {
  background-color: orange;
  -webkit-animation-delay: 2s;
  animation-delay: 2s;
}

.element-4 {
  background-color: #0099CC;
  -webkit-animation-delay: 3s;
  animation-delay: 3s;
}

@-webkit-keyframes zigzag {
  from {
    left: 0;
    top: 0;
  }
  15% {
    left: 50px;
    top: -50px;
  }
  30% {
    left: 100px;
    top: 0;
  }
  45% {
    left: 150px;
    top: -50px;
  }
  60% {
    left: 200px;
    top: 0;
  }
  75% {
    left: 250px;
    top: -50px;
  }
  100% {
    left: 300px;
    top: 0;
  }
}

@keyframes zigzag {
  from {
    left: 0;
    top: 0;
  }
  15% {
    left: 50px;
    top: -50px;
  }
  30% {
    left: 100px;
    top: 0;
  }
  45% {
    left: 150px;
    top: -50px;
  }
  60% {
    left: 200px;
    top: 0;
  }
  75% {
    left: 250px;
    top: -50px;
  }
  100% {
    left: 300px;
    top: 0;
  }
}