Masterpage and CSS problem: css,asp.net

Masterpage and CSS problem

I created a page using CSS that comes out fine in a browser but when I try to incorporate it into masterpages, I'm experiencing some problems. In the code below, I have the html and css which works fine. And below that I have my masterpage code and the contentplaceholder that uses the masterpage.

When I bring them both in the browser, it looks different. The masterpage one really looks different.

body {
 background-color:eeeeee;
 margin: auto auto;
 padding: 0px
}
 
#wrapper {
 width:800px;
 margin: 0 auto;
 border:3px dotted red;
 position:relative;
 vertical-align: middle
}
 
#header {
 width:760px;
 margin: 10px auto;
 border: 1px dashed blue;
 text-align:center;
 background-image: url(Nathanael/1122071244.jpg);
 background-repeat: no-repeat;
 height: 123px
}
 
#LNAV {
 width:180px;
 border:1px solid #333333;
 margin-left: 20px;
 float:left
}
 
#CONTENT {
  width: 550px;
  border: 2px solid brown;
  float:right;
  margin-right:20px;
  margin-bottom: 5px
}
 
#footer {
 clear:both;
 width:760px;
 text-align:center;
 border:1px dashed orange;
 margin: 5px auto
}
 
 
<HTML>
<HEAD>
   <TITLE></TITLE>
   <link  REL="StyleSheet" TYPE="text/css" HREF="sampleStyle.css">
</HEAD>
<BODY>
<DIV ID="wrapper">
<DIV ID="HEADER">HEADER</DIV>
<DIV ID="LNAV">LEFT NAVIGATOR</DIV>
<DIV ID="CONTENT">CONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENT
CONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENTCONTENT CONTENT CONTENT
</DIV>
<DIV ID="FOOTER">FOOTER</DIV>
</DIV>
</BODY>
</HTML>
 
 
<!-- Masterpage -->
 
<%@ Master Language="C#" AutoEventWireup="true" CodeFile="iwebarea.master.cs" Inherits="iwebarea" %>
 
<!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>IWEBAREA L.L.C</title>
    <link href="iwebareaStyle.css" rel="stylesheet" type="text/css" />
</head>
<body>
    
<DIV ID="wrapper">
    <DIV ID="HEADER">THIS HEADER IS SUPPOSED TO BE CENTERED</DIV>
        <DIV ID="LNAV">LEFT NAVIGATOR
         <ul>
         <li>NAV 1</li>
         <li>NAV 2</li>
         <li>NAV 3</li>
         <li>NAV 4</li>         
         </ul>
        </DIV>
          <div id="content">
              <asp:contentplaceholder id="pageContent" runat="server">
              </asp:contentplaceholder>
          </div>
          
        <DIV ID="FOOTER">This is the FOOTER</DIV>
</DIV>
 
</body>
</html>
 
 
<!--- ContentPlace Holder -->
<%@ Page Language="C#" MasterPageFile="~/iwebarea.master" AutoEventWireup="true" CodeFile="INDEX.aspx.cs" Inherits="INDEX" Title="Untitled Page" %>
<asp:Content ID="Content1" ContentPlaceHolderID="pageContent" Runat="Server">
Content AFVASF ASFSA SAF SAASF SAFASF ASF ASFS SAF SAFS SAF SAF SAFSAF SAF SAF ASFF SF SAFSAF SAF
ASFASF ASFSAFSA FASFAS FASF SAFASFASFSAFSAFASFSAFASFAS SFSA FSAFSAFSA FSAFSAFSAF SAFSAF ASFSAFASF 
ASFASFSAF ASF ASF ASFSA F SAFAS FASF SAFSA ASF ASF SAF SAF SAF ASF ASF SAF SAF SAFSAFSAFSAFASF 
</asp:Content>

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