css animation fade in

<html>
<style>

@-webkit-keyframes fadeIn{0%{opacity:0}100%{opacity:1}}
@-o-keyframes fadeIn{0%{opacity:0}100%{opacity:1}}
@keyframes fadeIn{0%{opacity:0}100%{opacity:1}}

.fade-in{
    animation-name: fadeIn;
    animation-timing-function: ease;
    animation-direction: normal;
    animation-play-state: running;
    -webkit-animation-name: fadeIn;
    -webkit-animation-timing-function: ease;
    -webkit-animation-direction: normal;
    -webkit-animation-play-state: running;
}


.icon-arrow{
    display: block;
    position: absolute;
    left: 50%;
     40px;
    height: 40px;
    margin-left: -20px;
    background: url("http://www.lewanau.com/public/weixin/css/img/icon-arrow.png") no-repeat left center;
    -webkit-animation: arrow-ani 1s linear infinite;
    -o-animation: arrow-ani 1s linear infinite;
    animation: arrow-ani 1s linear infinite;
}

@-o-keyframes arrow-ani {
    from{
        bottom:4%;
        opacity: 1;
    }
    to{
        bottom:6%;
        opacity: 0;
    }
}
@-webkit-keyframes arrow-ani {
    from{
        bottom:4%;
        opacity: 1;
    }
    to{
        bottom:6%;
        opacity: 0;
    }
}
@keyframes arrow-ani {
    from{
        bottom:4%;
        opacity: 1;
    }
    to{
        bottom:6%;
        opacity: 0;
    }
}

</style>

<body style="background:#666">

	<div class="animation fade-in" >
		<span class="icon-arrow"></span>
	</div>

</body>

</html>

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原文地址：https://www.cnblogs.com/tonnytong/p/6496830.html