.container
  .jumbotron
    h1 Jumbotron
  button.btn.btn-primary.bump Bump

@keyframes bounce {
  0%, 20%, 53%, 80%, 100% {
    transition-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
                     transform: translate3d(0,0,0);
               transform-style: preserve-3d;
                    box-shadow: 0 0 0 rgba(0,0,0,.9);
  }

  40%, 43% {
    transition-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
                     transform: translate3d(0, -30px, 0);
               transform-style: preserve-3d;
                    box-shadow: 0 30px 30px rgba(0,0,0,.01);
  }

  70% {
    transition-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
                     transform: translate3d(0, -15px, 0);
               transform-style: preserve-3d;
                    box-shadow: 0 15px 15px rgba(0,0,0,.5);
  }

  90% {
            transform: translate3d(0,-4px,0);
      transform-style: preserve-3d;
           box-shadow: 0 4px 4px rgba(4px,0,4px,.7);
  }
}
.bump {
           animation: bounce 1s infinite;
    transform-origin: center bottom;
  &:hover,
  &:focus {
    animation: none;
  }
}