@keyframes swing {

  20% {

    transform: rotate3d(0, 0, 1, 15deg);

  }



  40% {

    transform: rotate3d(0, 0, 1, -10deg);

  }



  60% {

    transform: rotate3d(0, 0, 1, 5deg);

  }



  80% {

    transform: rotate3d(0, 0, 1, -5deg);

  }



  to {

    transform: rotate3d(0, 0, 1, 0deg);

  }

}



.swing {

  transform-origin: top center;

  animation-name: swing;

}

