@-webkit-keyframes bump {
  from   { -webkit-transform: rotate(0deg)}
  50% { -webkit-transform: rotate(0deg);}
  to  { -webkit-transform: rotate(0deg)}
}


.truck {
  position:relative;
  display:block;
  width:350px;
  height:270px;
  margin: 0 auto;
  -webkit-transition: right 3s linear;
}

.truck:hover {
  right:-600px;
  -webkit-animation: bump 3s infinite linear;
}

#box { background:url(images/ban.png) no-repeat; width: 350px; margin: 0 auto;}