#wrapper {
 /* width: 600px;
  margin: 50px auto;*/
}
.bounce {
  -webkit-border-radius:50%;
  -moz-border-radius:50%;
  -ms-border-radius:50%;
  border-radius:50%;
  animation: bounce 2s infinite;
  -webkit-animation: bounce 2s infinite;
  -moz-animation: bounce 2s infinite;
  -o-animation: bounce 2s infinite;
}