.img-popinoutanim {
   -webkit-animation: pop 1s ease-in-out infinite alternate;
 animation: pop 1s ease-in-out infinite alternate;
 -moz-animation: pop 1s ease-in-out infinite alternate;
}
  
@keyframes pop {
from {
transform:scale(0.95)
}

50% {
transform:scale(1)
}

to {
transform:scale(0.95)
}
}