<style type="text/css">

.arrow {

    display: block;

    width: 20px;

    height: 20px;

    position: absolute;

    bottom: 25px;

    left: 50%;

    margin-left: -11px;

    border: 3px solid transparent;

    border-top: 3px solid #000;

    border-left: 3px solid #000;

    z-index: 99;

    opacity: .8;

    -webkit-transform: rotate(45deg);

    -webkit-animation: arrow 1.5s infinite ease-in-out;

}

@-webkit-keyframes arrow {

0% {

opacity:0;

-webkit-transform:translate(0, 0px) rotate(45deg)

}

50% {

opacity:1;

-webkit-transform:translate(0, -5px) rotate(45deg)

}

100% {

opacity:0;

-webkit-transform:translate(0, -10px) rotate(45deg)

}

}

</style>

<div class="arrow"></div>