これをいじり倒しましょう
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="ja" lang="ja">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Shift_JIS" />
<title>sample site</title>
<style>
div{
border: solid 2px;
}
div#header{
background-color: #ddd;
}
div#sub{
color: #fbb;
background-color: #06c;
}
div#main{
color: #abc;
background-color: #fc0;
}
div#footer{
color:#000;
background-color: #ddd;
}
</style>
</head>
<body>
<div id="header">
header
</div>
<div id="sub">
subsubsubsubsubsubsubsub
subsubsubsubsubsubsubsub
subsubsubsubsubsubsubsub
subsubsubsubsubsubsubsub
subsubsubsubsubsubsubsub
subsubsubsubsubsubsubsub
subsubsubsubsubsubsubsub
subsubsubsubsubsubsubsub
subsubsubsubsubsubsubsub
subsubsubsubsubsubsubsub
</div>
<div id="main">
mainmainmainmainmainmain
mainmainmainmainmainmain
mainmainmainmainmainmain
mainmainmainmainmainmain
mainmainmainmainmainmain
mainmainmainmainmainmain
mainmainmainmainmainmain
mainmainmainmainmainmain
mainmainmainmainmainmain
mainmainmainmainmainmain
mainmainmainmainmainmain
</div>
<div id="footer">
footer
</div>
</body>
</html>