滑动门

css代码

*{
            margin: 0;
            padding: 0;
        }
        .box{
            width: 100%;
            height: 60px;
            background: url("image/bg.png") repeat-x;
        }
        li{
            float: left;
            list-style: none;
            margin: 0px 15px;
            line-height: 36px;
            position: relative;
        }
        a{
            text-decoration: none;
            color: #ffffff;
            display: inline-block;
            width:85px;
            height: 37px;
            line-height: 28px;
            text-align: center;
        }
        a:hover{
            background: url("image/btn.png") no-repeat;
            color: #388201;
        }
        span{
            display: inline-block;
            width: 0;
            height: 0;
            border:10px solid;
            border-color: transparent;
            margin-top: 22px;
            margin-left: -26px;
            position: absolute;
        }

        a:hover span {
            border-color: #ffffff transparent transparent transparent;
        }

html代码：

<div class="box">
    <ul>
        <li><a href="#">首页<span></span></a></li>
        <li><a href="#">首页<span></span></a></li>
        <li><a href="#">首页<span></span></a></li>
        <li><a href="#">首页<span></span></a></li>
        <li><a href="#">首页<span></span></a></li>
        <li><a href="#">首页<span></span></a></li>
        <li><a href="#">首页<span></span></a></li>
        <li><a href="#">首页<span></span></a></li>
    </ul>
</div>