@keyframes pulse {
  from {
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=40)";
    filter: alpha(opacity=40);
    opacity: .4;
    top: 0;
  }

  50% {
    -ms-filter: none;
    filter: none;
    opacity: 1;
    top: -1rem;
  }

  to {
    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=40)";
    filter: alpha(opacity=40);
    opacity: .4;
    top: 0
  }
}