.bar {
  background:#03F;
  height: 8px;
  width:5px;
  transition-property: height;
  transition-duration: 1s;
  transition-timing-function: ease-in-out;
  -moz-animation: move 1s infinite ease-in-out;
  -webkit-animation: move 1s infinite ease-in-out;
}

@-moz-keyframes move {
0% {
        -moz-transform: scaley(1.2);
    }

    100% {
        -moz-transform: scaley(0.2);
    };
}

@-webkit-keyframes move {
  0% {
        -webkit-transform: scaley(1.2);
    }

    100% {
        -webkit-transform: scaley(0.2);
    };
}