[code] pop image

<style>


#whitespace {
  display: inline-block;

  width:100%;
  height:auto;
  animation: pop 1s ease-in-out infinite alternate;
  border: 3px double black;
  overflow: hidden;
}
#whitespace img {
  display: block;
   width:100%;
  height:auto;

  }

@keyframes
pop {
from { transform:scale(0.95) }
50% { transform:scale(1) }
to { transform:scale(0.95) }
}

</style>

<div id="whitespace"><img src="imgurl"></div>