我想做的是给一个 divmargin-top: 30px;
但它似乎将整个页面向下移动了 30px,而不是只有那个 div。就像子 div 正在影响父 div?
有什么建议么?
html:
<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="BBcolForum.master.cs" Inherits="BBcolForum.BBcolForum" %>
<!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 runat="server">
<title></title>
<link type="text/css" rel="stylesheet" href="css/default.css" />
<asp:ContentPlaceHolder ID="head" runat="server">
</asp:ContentPlaceHolder>
</head>
<body>
<div id="content">
<form id="form1" runat="server">
<div class="header" style="margin-top:0px;">
<h1 style="color:Aqua; margin-top:30px;">Student Forum</h1>
</div>
<div>
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</div>
</body>
</html>
CSS;
body
{
background-image:url('/img/blue_back.png');
background-repeat:repeat-x;
}
#content
{
background-color:White;
width: 800px;
height:900px;
margin: 0 auto 0 auto;
}
.header
{
border-bottom:1px solid #000000;
height:100px;
color:Blue;
}