.sk-wave {
    margin: 40px auto;
    width: 50px;
    height: 40px;
    text-align: center;
    font-size: 10px; }
    .sk-wave .sk-rect {
      background-color: #333;
      height: 100%;
      width: 6px;
      display: inline-block;
      -webkit-animation: sk-waveStretchDelay 1.2s infinite ease-in-out;
              animation: sk-waveStretchDelay 1.2s infinite ease-in-out; }
    .sk-wave .sk-rect1 {
      -webkit-animation-delay: -1.2s;
              animation-delay: -1.2s; }
    .sk-wave .sk-rect2 {
      -webkit-animation-delay: -1.1s;
              animation-delay: -1.1s; }
    .sk-wave .sk-rect3 {
      -webkit-animation-delay: -1s;
              animation-delay: -1s; }
    .sk-wave .sk-rect4 {
      -webkit-animation-delay: -0.9s;
              animation-delay: -0.9s; }
    .sk-wave .sk-rect5 {
      -webkit-animation-delay: -0.8s;
              animation-delay: -0.8s; }
  @-webkit-keyframes sk-waveStretchDelay {
    0%, 40%, 100% {
      -webkit-transform: scaleY(0.4);
              transform: scaleY(0.4); }
    20% {
      -webkit-transform: scaleY(1);
              transform: scaleY(1); } }
  @keyframes sk-waveStretchDelay {
    0%, 40%, 100% {
      -webkit-transform: scaleY(0.4);
              transform: scaleY(0.4); }
    20% {
      -webkit-transform: scaleY(1);
              transform: scaleY(1); } }