The display in Dreanweaver is different from the display in the browser. I don't know what's wrong. The border cannot be added to the div_html/css

I want this display effect
[img=http://b304.photo.store.qq.com/psb?/V12O1gKZ10Scjj/UCz9sb776cJ6STaK6hFMaE5wi000A8G0Y4UqwjaA*.w!/b/YVBPNLXLcgAAYi79PrXYcgAA][/img ]
The result is like this
[img=http://b304.photo.store.qq.com/psb?/V12O1gKZ10Scjj/9gMg6IaicVievcei*IPPrs00r2gm4zvzrCt9szQkcds!/b/YXngO7UpcwAAYpP6PrVycgAA][/img]
Source code

<html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title>    	<meta http-equiv="pragma" content="no-cache">	<meta http-equiv="cache-control" content="no-cache">	<meta http-equiv="expires" content="0">    	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">	<meta http-equiv="description" content="This is my page">	<!--	<link rel="stylesheet" type="text/css" href="styles.css">	-->    <script type="text/javascript" src="js/jquery-1.7.2.js"></script>    <script type="text/javascript">    	$(".navitems li a").click(function(){			$(".navitems li a").css("background","url(images/libg.png)");		});    </script>	<style type="text/css">		div{ border:1px solid #666}		.newsbody{ width:1000px; margin:0 auto;}		.content{ width:998px; margin:0 auto; padding-top:10px; border:1px solid #999; border-bottom:none}    	.nav{ background:url(images/navbg.png) top left;width:1000px; height:30px; line-height:0px; overflow:hidden; margin: 0 auto;}		.navitems{ list-style:none;}		.navitems li{ float:left; margin-right:10px; margin-left:0px; border-right:#FFC; border:1px;}		.navitems li a{ text-align:center; color:#FFF; text-decoration:none; font-size:15px;  vertical-align:middle}		.navitems li a:hover{text-decoration:underline};		.hotnews{ width:700px; height:400px;}		.hotnews div{ float:left}		.banner{	position:relative;	left:0px;	width:700px;	height:30px;	background:url(images/banner.png);	text-align:left;	line-height:30px;	overflow: hidden;	background-color: #FFFFFF;}		.hotnewsitems{ width:450px; height:360px; position:relative; left:0px; margin-top:10px; overflow:hidden}		.news{ list-style:circle;}		.news li{ margin-top:10px;}		.news li a{ text-decoration:none;}		.news li a:hover{ text-decoration:underline;}		.gundong{ margin-left:10px; width:230px; height:195px; position:relative; margin-top:10px;}		.hotvideo{ width:230px; height:155px; margin-left:10px; margin-top:10px;}    </style>   </head>       <body>  <div class="nav">    	<ul class="navitems">            <li style="padding-left:0px"><a href="#">新闻首页</a></li>            <li><a href="#">国内</a></li>            <li><a href="#">国际</a></li>            <li><a href="#">军事</a></li>            <li><a href="#">财经</a></li>            <li><a href="#">互联网</a></li>            <li><a href="#">房产</a></li>            <li><a href="#">汽车</a></li>            <li><a href="#">体育</a></li>            <li><a href="#">娱乐</a></li>            <li><a href="#">游戏</a></li>            <li><a href="#">体育</a></li>            <li><a href="#">女人</a></li>            <li><a href="#">科技</a></li>            <li><a href="#">社会</a></li>            <li><a href="#">视频</a></li>            <li><a href="#">图片</a></li>            <li><a href="#">人物</a></li>            <li><a href="#">最新</a></li>            <li><a href="#">定制</a></li>            <li><a href="#">更多>></a></li>        </ul>  </div>         <div class="content">         	           <div class="hotnews">             					 <div class="banner"> 焦点新闻>> </div>            					 <div class="hotnewsitems">                                       <ul class="news">                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                       </ul>            					 </div>                                 <div class="gundong">adf </div>                                 <div class="hotvideo">问题在这</div>          				 </div>         </div>  </body></html>

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Reply to discussion (solution)

<html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title>        <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->    <script type="text/javascript" src="js/jquery-1.7.2.js"></script>    <script type="text/javascript">        $(".navitems li a").click(function(){            $(".navitems li a").css("background","url(images/libg.png)");        });    </script>    <style type="text/css">.clear { *zoom:1; }.clear:before, .clear:after{	display:block; content:'clear'; clear:both; height:0; overflow:hidden;}	        div{ border:1px solid #666}        .newsbody{ width:1000px; margin:0 auto;}        .content{ width:998px; margin:0 auto; padding-top:10px; border:1px solid #999; border-bottom:none;}        .nav{ background:url(images/navbg.png) top left;width:1000px; height:30px; line-height:0px; overflow:hidden; margin: 0 auto;}        .navitems{ list-style:none;}        .navitems li{ float:left; margin-right:10px; margin-left:0px; border-right:#FFC; border:1px;}        .navitems li a{ text-align:center; color:#FFF; text-decoration:none; font-size:15px;  vertical-align:middle}        .navitems li a:hover{text-decoration:underline};        .hotnews{ width:700px; height:400px; }        .banner{    position:relative;    left:0px;    width:700px;    height:30px;    background:url(images/banner.png);    text-align:left;    line-height:30px;    overflow: hidden;    background-color: #FFFFFF;}        .hotnewsitems{ float:left;width:450px; height:360px; position:relative; left:0px; margin-top:10px; overflow:hidden}        .news{ list-style:circle;}        .news li{ margin-top:10px;}        .news li a{ text-decoration:none;}        .news li a:hover{ text-decoration:underline;}        .gundong{ margin-left:460px; _margin-left:457px; width:230px; height:195px; position:relative; margin-top:10px;}        .hotvideo{ margin-left:460px;_margin-left:457px; width:230px; height:155px; margin-top:10px;}    </style>   </head>       <body>  <div class="nav">        <ul class="navitems">            <li style="padding-left:0px"><a href="#">新闻首页</a></li>            <li><a href="#">国内</a></li>            <li><a href="#">国际</a></li>            <li><a href="#">军事</a></li>            <li><a href="#">财经</a></li>            <li><a href="#">互联网</a></li>            <li><a href="#">房产</a></li>            <li><a href="#">汽车</a></li>            <li><a href="#">体育</a></li>            <li><a href="#">娱乐</a></li>            <li><a href="#">游戏</a></li>            <li><a href="#">体育</a></li>            <li><a href="#">女人</a></li>            <li><a href="#">科技</a></li>            <li><a href="#">社会</a></li>            <li><a href="#">视频</a></li>            <li><a href="#">图片</a></li>            <li><a href="#">人物</a></li>            <li><a href="#">最新</a></li>            <li><a href="#">定制</a></li>            <li><a href="#">更多>></a></li>        </ul>  </div>         <div class="content clear">                        <div class="hotnews">                                  <div class="banner"> 焦点新闻>> </div>                                 <div class="hotnewsitems">                                       <ul class="news">                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                       </ul>                                 </div>                                 <div class="gundong">adf </div>                                 <div class="hotvideo">问题在这</div>                           </div>         </div>  </body></html>

Copy after login

The poster tried

simulated this problem

<!DOCTYPE HTML><html>	<head>		<meta charset="gb2312" />		<title></title>		<style>			div {				border:1px solid #000;							}			.a {				width:450px;				height:300px;				float:left;			}			.b {				margin-left:460px; _margin-left:457px;				width:100px; height:200px;			}			.c {				margin-top:10px;				margin-left:460px; _margin-left:457px;				width:100px; height:50px;			}					</style>	</head>	<body>		<div class="a"></div>		<div class="b"></div>		<div class="c"></div>	</body></html>

Copy after login

<html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'index.jsp' starting page</title>        <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->    <script type="text/javascript" src="js/jquery-1.7.2.js"></script>    <script type="text/javascript">        $(".navitems li a").click(function(){            $(".navitems li a").css("background","url(images/libg.png)");        });    </script>    <style type="text/css">.clear { *zoom:1; }.clear:before, .clear:after{	display:block; content:'clear'; clear:both; height:0; overflow:hidden;}	        div{ border:1px solid #666}        .newsbody{ width:1000px; margin:0 auto;}        .content{ width:998px; margin:0 auto; padding-top:10px; border:1px solid #999; border-bottom:none;}        .nav{ background:url(images/navbg.png) top left;width:1000px; height:30px; line-height:0px; overflow:hidden; margin: 0 auto;}        .navitems{ list-style:none;}        .navitems li{ float:left; margin-right:10px; margin-left:0px; border-right:#FFC; border:1px;}        .navitems li a{ text-align:center; color:#FFF; text-decoration:none; font-size:15px;  vertical-align:middle}        .navitems li a:hover{text-decoration:underline};        .hotnews{ width:700px; height:400px; }        .banner{    position:relative;    left:0px;    width:700px;    height:30px;    background:url(images/banner.png);    text-align:left;    line-height:30px;    overflow: hidden;    background-color: #FFFFFF;}        .hotnewsitems{ float:left;width:450px; height:360px; position:relative; left:0px; margin-top:10px; overflow:hidden}        .news{ list-style:circle;}        .news li{ margin-top:10px;}        .news li a{ text-decoration:none;}        .news li a:hover{ text-decoration:underline;}        .gundong{ margin-left:460px;_margin-left:457px; width:230px; height:195px; position:relative; margin-top:10px;}        .hotvideo{ margin-left:460px;_margin-left:457px; width:230px; height:155px; margin-top:10px;}    </style>   </head>       <body>  <div class="nav">        <ul class="navitems">            <li style="padding-left:0px"><a href="#">新闻首页</a></li>            <li><a href="#">国内</a></li>            <li><a href="#">国际</a></li>            <li><a href="#">军事</a></li>            <li><a href="#">财经</a></li>            <li><a href="#">互联网</a></li>            <li><a href="#">房产</a></li>            <li><a href="#">汽车</a></li>            <li><a href="#">体育</a></li>            <li><a href="#">娱乐</a></li>            <li><a href="#">游戏</a></li>            <li><a href="#">体育</a></li>            <li><a href="#">女人</a></li>            <li><a href="#">科技</a></li>            <li><a href="#">社会</a></li>            <li><a href="#">视频</a></li>            <li><a href="#">图片</a></li>            <li><a href="#">人物</a></li>            <li><a href="#">最新</a></li>            <li><a href="#">定制</a></li>            <li><a href="#">更多>></a></li>        </ul>  </div>         <div class="content clear">                        <div class="hotnews clear">                                  <div class="banner"> 焦点新闻>> </div>                                 <div class="hotnewsitems">                                       <ul class="news">                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                         <li><a href="#">外交部回应朝鲜扣押中国渔民:属渔业案件</a></li>                                       </ul>                                 </div>                                 <div class="gundong">adf </div>                                 <div class="hotvideo">问题在这</div>                           </div>         </div>  </body></html>

Copy after login

Try

I simulated this problem

<!DOCTYPE HTML><html>	<head>		<meta charset="gb2312" />		<title></title>		<style>			div {				border:1px solid #000;							}			.a {				width:450px;				height:300px;				float:left;			}			.b {				margin-left:460px; _margin-left:457px;				width:100px; height:200px;			}			.c {				margin-top:10px;				margin-left:460px; _margin-left:457px;				width:100px; height:50px;			}					</style>	</head>	<body>		<div class="a"></div>		<div class="b"></div>		<div class="c"></div>	</body></html>

Copy after login

Can you watch it? What is the problem with my code? I feel like there's something wrong with the hotnews div. Can't I add a border to it?

The picture is invisible