1119 网页布局，css写下拉列表

<style type="text/css">

*{ margin:0px; padding:0px;}

#body{ width:1000px; height:2000px; margin:auto; position:relative;}

#top_1{ width:1000px; height:115px; border:1px solid #999; position:relative; box-shadow:1px 1px 1px #999999}

#top_2{ width:1000px; height:70px; border:1px solid #CCC; margin-top:10px; position:relative; box-shadow:2px 2px 2px #999999}

#top_3{ width:240px; height:240px; border:1px solid #ccc; margin-top:10px; position:relative; float:left; box-shadow:2px 2px 2px #999999}

#top_4{ width:750px; height:270px; border:1px solid #ccc; position: relative; float:right; left:2px; margin-top:10px; box-shadow:2px 2px 2px #999999}

#top_5{ width:240px; height:120px; border:1px solid #ccc; position:relative; margin-top:10px; float:left; box-shadow:2px 2px 2px #999999}

#top_6{ width:750px; height:40px; border:1px solid #ccc; position:relative; float:right; left:2px; margin-top:10px; box-shadow:2px 2px 2px #999999}

#top_7{ width:750px; height:215px; border:1px solid #ccc; position:relative; float:right; left:2px; margin-top:10px; box-shadow:2px 2px 2px #999999}

#top_8{ width:240px; height:1000px; border:1px solid #ccc; position:relative; float:left; margin-top:10px; box-shadow:2px 2px 2px #999999}

#top_9{ width:750px; height:780px; border:1px solid #ccc; position:relative; float:right; left:2px; margin-top:10px; box-shadow:2px 2px 2px #999999}

#top_10{ width:750px; height:30px; border:1px solid #ccc; position:relative; float:right; left:2px; margin-top:10px; box-shadow:2px 2px 2px #999999}

#top_11{ width:1000px; height:200px; border:1px solid #ccc; position:relative; float:left; margin-top:10px; box-shadow:2px 2px 2px #999999}

#nei_1{ width:333px; height:200px; border-right:1px solid #ccc; float:left; box-shadow:2px 2px 2px #999999}

#nei_2{ width:332px; height:200px; border-right:1px solid #ccc; float:left; box-shadow:2px 2px 2px #999999}

#nei_3{ width:333px; height:200px; float:left; box-shadow:2px 2px 2px #999999}

.daohang{ width:100px; height:40px; float:left; background-color:#F00; position:relative; overflow:hidden; margin-left:10px; margin-top:10px;}

.daohang:hover{ overflow:visible; cursor:pointer}

.xiala{ width:100px; height:40px; background-color:#00F; position:relative; margin-top:40px; overflow:hidden;}

.xiala2{ width:100px; height:40px; background-color:#FF0; position:relative; margin-left:100px;}

.xiala:hover{ overflow:visible; cursor:pointer}

.xiala3{ width:100px; height:40px; background-color:#0F0; position:relative; overflow:hidden;}

.xiala2:hover{ overflow:visible}

.xiala4{ width:100px; height:40px; background-color:#999; position:relative; overflow:hidden; margin-left:100px;}

.xiala3:hover{ overflow:visible}

.xiala5{ width:100px; height:40px; background-color:#000; position:relative; overflow:hidden;}

.xiala5:hover{ overflow:visible}

.xiala6{ width:100px; height:40px; background-color:#300; position:relative; overflow:hidden; margin-left:100px;}

</style>

</head>

<body>

<div id="body">

<div id="top_1"></div>

<div id="top_2"></div>

<div id="top_3"></div>

<div id="top_4"></div>

<div id="top_5"></div>

<div id="top_6"></div>

<div id="top_7"></div>

<div id="top_8"></div>

<div id="top_9"></div>

<div id="top_10"></div>

<div id="top_11">

    <div id="nei_1"></div>

    <div id="nei_2"></div>

    <div id="nei_3"></div>

</div>

    <div class="daohang">

        <div class="xiala">

            <div class="xiala2"></div>

        </div>

        <div class="xiala3">

            <div class="xiala4"></div>

        </div>

        <div class="xiala5">

            <div class="xiala6"></div>

        </div>

    </div>

    <div class="daohang">

        <div class="xiala">

            <div class="xiala2"></div>

        </div>

        <div class="xiala3">

            <div class="xiala4"></div>

        </div>

        <div class="xiala5">

            <div class="xiala6"></div>

        </div>

    </div>

    <div class="daohang">

        <div class="xiala">

            <div class="xiala2"></div>

        </div>

        <div class="xiala3">

            <div class="xiala4"></div>

        </div>

        <div class="xiala5">

            <div class="xiala6"></div>

        </div>

    </div>

</div>

</body>

</html>
1119 网页布局，css写下拉列表