<div class="bounce" style="width:20px;height:20px;border:1px solid red;"></div>

.bounce:hover{border:1px solid #FF00FF;background:#00FF00;-webkit-animation:bounce 1s;animation:bounce 1s;animation-iteration-count: infinite;-webkit-transform-origin:center bottom;transform-origin:center bottom;}

@-webkit-keyframes bounce{from,20%,53%,80%,to{-webkit-animation-timing-function:cubic-bezier(0.215,0.610,0.355,1.000);animation-timing-function:cubic-bezier(0.215,0.610,0.355,1.000);-webkit-transform:translate3d(0,0,0);transform:translate3d(0,0,0);}40%,43%{-webkit-animation-timing-function:cubic-bezier(0.755,0.050,0.855,0.060);animation-timing-function:cubic-bezier(0.755,0.050,0.855,0.060);-webkit-transform:translate3d(0,-15px,0);transform:translate3d(0,-15px,0);}70%{-webkit-animation-timing-function:cubic-bezier(0.755,0.050,0.855,0.060);animation-timing-function:cubic-bezier(0.755,0.050,0.855,0.060);-webkit-transform:translate3d(0,-7px,0);transform:translate3d(0,-7px,0);}90%{-webkit-transform:translate3d(0,-2px,0);transform:translate3d(0,-2px,0);}}

@keyframes bounce{from,20%,53%,80%,to{-webkit-animation-timing-function:cubic-bezier(0.215,0.610,0.355,1.000);animation-timing-function:cubic-bezier(0.215,0.610,0.355,1.000);-webkit-transform:translate3d(0,0,0);transform:translate3d(0,0,0);}40%,43%{-webkit-animation-timing-function:cubic-bezier(0.755,0.050,0.855,0.060);animation-timing-function:cubic-bezier(0.755,0.050,0.855,0.060);-webkit-transform:translate3d(0,-15px,0);transform:translate3d(0,-15px,0);}70%{-webkit-animation-timing-function:cubic-bezier(0.755,0.050,0.855,0.060);animation-timing-function:cubic-bezier(0.755,0.050,0.855,0.060);-webkit-transform:translate3d(0,-7px,0);transform:translate3d(0,-7px,0);}90%{-webkit-transform:translate3d(0,-2px,0);transform:translate3d(0,-2px,0);}}

.bounceIn{-webkit-animation-name:bounceIn;animation-name:bounceIn;}

@-webkit-keyframes bounceIn{from,20%,40%,60%,80%,to{-webkit-animation-timing-function:cubic-bezier(0.215,0.610,0.355,1.000);animation-timing-function:cubic-bezier(0.215,0.610,0.355,1.000);}0%{opacity:;-webkit-transform:scale3d(.3,.3,.3);transform:scale3d(.3,.3,.3);}20%{-webkit-transform:scale3d(1.1,1.1,1.1);transform:scale3d(1.1,1.1,1.1);}40%{-webkit-transform:scale3d(.9,.9,.9);transform:scale3d(.9,.9,.9);}60%{opacity:;-webkit-transform:scale3d(1.03,1.03,1.03);transform:scale3d(1.03,1.03,1.03);}80%{-webkit-transform:scale3d(.97,.97,.97);transform:scale3d(.97,.97,.97);}to{opacity:;-webkit-transform:scale3d(1,1,1);transform:scale3d(1,1,1);}}

@keyframes bounceIn{from,20%,40%,60%,80%,to{-webkit-animation-timing-function:cubic-bezier(0.215,0.610,0.355,1.000);animation-timing-function:cubic-bezier(0.215,0.610,0.355,1.000);}0%{opacity:;-webkit-transform:scale3d(.3,.3,.3);transform:scale3d(.3,.3,.3);}20%{-webkit-transform:scale3d(1.1,1.1,1.1);transform:scale3d(1.1,1.1,1.1);}40%{-webkit-transform:scale3d(.9,.9,.9);transform:scale3d(.9,.9,.9);}60%{opacity:;-webkit-transform:scale3d(1.03,1.03,1.03);transform:scale3d(1.03,1.03,1.03);}80%{-webkit-transform:scale3d(.97,.97,.97);transform:scale3d(.97,.97,.97);}to{opacity:;-webkit-transform:scale3d(1,1,1);transform:scale3d(1,1,1);}}