css3动画怎么定位_html/css_WEB-ITnose

.pr{ overflow:hidden; position:relative; top:0; left:0; height:340px;}
.content{ overflow:hidden;width:72%; background-color:#ffe200; margin:0 auto; position:absolute; left:14%; top:0; z-index:5;}
.jiage{overflow:hidden;width:72%; background-color:#333335; margin:0 auto; position:absolute; left:14%;top:-170px; z-index:1; -webkit-animation:myFirst 3s linear; }
@-webkit-keyframes myFirst
{
from{ top:-170px;}
to{ top:140px;}
}

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