网页无法顶格（VS 2008/CSS，网页套用了母版）
0
悬赏园豆：30
[已关闭问题]
VS2008创建的项目中，网页套用了母版，并使用默认的CSS，但试了N种方法（包括修改CSS、修改母版的元素属性，或者同时修改，当然也可能是我使用的方法都不对...-_-!）都无法实现让网页格顶，总是在网页的顶头空出10PX左右的空白，郁闷了。。。
只有在些请各位朋友帮下帮，先谢谢了。
下为默认的CSS（貌似VS2008使用的是Css2.1）。。。
body {
min-width: 780px;
margin: 0;
padding: 0;
border: 10;
text-align: center;
font-family: "Trebuchet MS", "Lucida Grande", Arial, Helvetica, sans-serif;
font-size: 85%;
color: #666666;
background-color: #B2CFE6;
}
h1, h2, h3, h4, h5, h6 {color: #0066CB;}
h1 {
font-size: 2.0em;
font-weight: normal;
}
#mainwrapper {
margin: 0 auto;
width: 100%;
min-width: 780px;
text-align: left;
}
#header {
margin-left: 0px;
margin-bottom: 0px;
color: #FFFFFF;
background-color: #8CA7BB;
border:solid 1px #005AC5;
font-size: 2.0em;
font-weight: normal;
padding:10px;
border-bottom:solid 4px Black;
}
#header-bottom
{
width:100%;
font-size: 14px;
font-style: italic;
}
#content {
width: 100%;
border:solid 1px #005AC5;
background-color:White;
border-top:solid 1px Black;
}
#content-left {
width:180px;
padding-top:10px;
}
#content-right
{
width:auto;
border-left:1px solid #A7A7A7;
padding:15px;
vertical-align:top;
}
#breadcrumb
{
width: 100%;
font-family: Verdana;
font-size: 9pt;
}
#breadcrumb a
{
color: #0066CB;
text-decoration: none;
}
#breadcrumb a:hover
{
text-decoration: underline;
}
#footer
{
width:100%;
font-size: 0.8em;
font-style: italic;
text-align: left;
}
.menu_nodeStyle
{
color:Black;
font-family:"Verdana";
font-size:8pt;
padding: 5px 5px 5px 5px;
width:100%;
border:solid 1px White;
}
.menu_hoverNodestyle
{
background-color:#CCCCCC;
border:solid 1px #888888;
cursor:pointer;
}
.menu_selectedNodestyle
{
padding: 5px 5px 5px 5px;
font-weight:bold;
color:#0066CB;
}
问题补充：
补充母版的页面代码：
<%@ Master Language="C#" AutoEventWireup="true" CodeFile="DefaultMaster.master.cs"
Inherits="HelloWorld.Shell.MasterPages.DefaultMaster" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head" runat="server">
<title>HelloWorldApplication</title>
</head>
<body>
<form id="mainForm" runat="server">
<asp:ScriptManager ID="DefaultMasterScriptManager" runat="server">
</asp:ScriptManager>
<div id="mainwrapper">
<div id="header">
<table style="width:100%">
<tr>
<td>
HelloWorldApplication
<div id="header-bottom">Created with the Web Client Software Factory
</div>
</td>
</tr>
</table>
</div>
<table id="content" width="100%">
<tr>
<td id="content-left" valign="top">
<asp:TreeView ID="NavigationTreeView" runat="server" ExpandDepth="2" DataSourceID="ApplicationSiteMap" />
</td>
<td id="content-right">
<div id="breadcrumb">
<asp:SiteMapPath ID="DefaultBreadCrumb" SiteMapProvider="DefaultSiteMapProvider" runat="server" />
</div>
<asp:ContentPlaceHolder ID="DefaultContent" runat=&quo
