css动态导航栏鼠标悬停特效

@charset "utf-8";
/*科e互联特效基本框架CSS*/
body, ul, dl, dd, dt, ol, li, p, h1, h2, h3, h4, h5, h6, textarea, form, select, fieldset, table, td, div, input {margin:0;padding:0;-webkit-text-size-adjust: none}
h1, h2, h3, h4, h5, h6{font-size:12px;font-weight:normal}
body>div{margin:0 auto}
div {text-align:left}
a img {border:0}
body { color: #333; text-align: center; font: 14px "微软雅黑"; }
ul, ol, li {list-style-type:none;vertical-align:0}
a {outline-style:none;color:#535353;text-decoration:none}
a:hover { color: #D40000; text-decoration: none}
.clear{height:0; overflow:hidden; clear:both}
.button {display: inline-block;zoom: 1; *display: inline;vertical-align: baseline;margin: 0 2px;outline: none;cursor: pointer;text-align: center;text-decoration: none;font: 14px/100% Arial, Helvetica, sans-serif;padding:0.25em 0.6em 0.3em;text-shadow: 0 1px 1px rgba(0,0,0,.3);-webkit-border-radius: .5em; -moz-border-radius: .5em;border-radius: .5em;-webkit-box-shadow: 0 1px 2px rgba(0,0,0,.2);-moz-box-shadow: 0 1px 2px rgba(0,0,0,.2);box-shadow: 0 1px 2px rgba(0,0,0,.2);
}
.red {color: #faddde;border: solid 1px #980c10;background: #d81b21;background: -webkit-gradient(linear, left top, left bottom, from(#ed1c24), to(#A51715));background: -moz-linear-gradient(top,  #ed1c24,  #A51715);filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#ed1c24', endColorstr='#aa1317');
}
.red:hover { background: #b61318; background: -webkit-gradient(linear, left top, left bottom, from(#c9151b), to(#a11115)); background: -moz-linear-gradient(top,  #c9151b,  #a11115); filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#c9151b', endColorstr='#a11115'); color:#fff;}
.red:active {color: #de898c;background: -webkit-gradient(linear, left top, left bottom, from(#aa1317), to(#ed1c24));background: -moz-linear-gradient(top,  #aa1317,  #ed1c24);filter:  progid:DXImageTransform.Microsoft.gradient(startColorstr='#aa1317', endColorstr='#ed1c24');}
.cor_bs,.cor_bs:hover{color:#ffffff;}
.keBody{background:url(../images/bodyBg.jpg) repeat #333;}
.keTitle{height:100px; line-height:100px; font-size:30px; font-family:'微软雅黑'; color:#FFF; text-align:center; background:url(../images/bodyBg3.jpg) repeat-x bottom left; font-weight:normal}
.kePublic{ background: url(../dark_wood.png) 0 0 repeat; padding: 100px 0px; text-align: center; }
.keBottom{color:#FFF; padding-top:25px; line-height:28px; text-align:center; font-family:'微软雅黑'; background:url(../images/bodyBg2.jpg) repeat-x top left; padding-bottom:25px}
.keTxtP{font-size:16px; color:#ffffff;}
.keUrl{color:#FFF; font-size:30px;}
.keUrl:hover{ text-decoration: underline; color: #FFF; }
.mKeBanner,.mKeBanner div{text-align:center;}
/*科e互联特效基本框架CSS结束，应用特效时，以上样式可删除*/
/* 效果CSS开始 */
body { margin: auto; text-align: center; }
.ribbon { display: inline-block; }
.ribbon:after, .ribbon:before { margin-top: 0.5em; content: ""; float: left; border: 1.5em solid #fff; }
.ribbon:after { border-right-color: transparent; }
.ribbon:before { border-left-color: transparent; }
.ribbon a:link, .ribbon a:visited { color: #000; text-decoration: none; float: left; height: 3.5em; overflow: hidden; }
.ribbon span { background: #fff; display: inline-block; line-height: 3em; padding: 0 1em; margin-top: 0.5em; position: relative; -webkit-transition: background-color 0.2s, margin-top 0.2s;  /* Saf3.2+, Chrome */ -moz-transition: background-color 0.2s, margin-top 0.2s;  /* FF4+ */ -ms-transition: background-color 0.2s, margin-top 0.2s;  /* IE10 */ -o-transition: background-color 0.2s, margin-top 0.2s;  /* Opera 10.5+ */ transition: background-color 0.2s, margin-top 0.2s; }
.ribbon a:hover span { background: #FFD204; margin-top: 0; }
.ribbon span:before { content: ""; position: absolute; top: 3em; left: 0; border-right: 0.5em solid #9B8651; border-bottom: 0.5em solid #fff; }
.ribbon span:after { content: ""; position: absolute; top: 3em; right: 0; border-left: 0.5em solid #9B8651; border-bottom: 0.5em solid #fff; }
/* 效果CSS结束 */

背景图