animate.css/source/attention_seekers/jello.css

@keyframes jello {
  from, 11.1%, to {
    transform: none
  }
  22.2% {
    transform: skewX(-12.5deg) skewY(-12.5deg)
  }
  33.3% {
    transform: skewX(6.25deg) skewY(6.25deg)
  }
  44.4% {
    transform: skewX(-3.125deg) skewY(-3.125deg)
  }
  55.5% {
    transform: skewX(1.5625deg) skewY(1.5625deg)
  }
  66.6% {
    transform: skewX(-0.78125deg) skewY(-0.78125deg)
  }
  77.7% {
    transform: skewX(0.390625deg) skewY(0.390625deg)
  }
  88.8% {
    transform: skewX(-0.1953125deg) skewY(-0.1953125deg)
  }
}



.jello{
    animation-name:jello;
    transform-origin: center
}