body{
  background-image:url("static.gif");
}

div{
  color:white;
  animation:shake;
  animation-duration:0.05s;
  animation-iteration-count: infinite;
  position:absolute;
  left:50%;
  top:50%;
}

@keyframes shake{
  from{transform:translate(5px);}
  to{transform:translate(-5px);}
}