下边是网页源码，大佬们也可以直接访问http://3future.com观察一下！
说明：图像是JPG格式，没有透明的外边距；
margin padding也清空了
cellspacing 和cellpadding也清空过，不起作用
<html>
<head>
<title>三维书屋|前程锦绣</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script>
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
hm.src = "https://hm.baidu.com/hm.js?e4e2853a486fb45e2a89553ce641d3a2";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
<style>
#nav ul {
display:block;
height:40px;
margin-left:7.5%;
margin-right:7.5%;
padding:0;
list-style:none;
border-top:solid 5px #DAA520;
border-bottom:solid 5px #DAA520;
background:url(img/navig-bg.jpg);
}
#nav ul li {
float:left;
text-align:center;
width:25%;
font:20px/2 "microsoft yahei";
}
#nav ul li a {
text-decoration:none; color:#800080;
}
#nav ul li a:hover {
display:block; color:#FFFFFF; background:#cfc0aa;
}
body{
margin:0px;
padding:0px;
background-image:url(./11.jpg)}
</style>
</head>
<body bgcolor="#ffffff" style="text-align:center; ">
<table id="imgsrc" style="width: 85vw; margin: 0px auto;border:20px solid #d8f4ff;">
<tr>
<td>
<img src="1.jpg" width="100%" </td>
</tr>
</table>
</br>
<center>路漫漫其修远兮，吾将上下而求索！</center>
<br>
<div id="nav">
<ul>
<li><a href="#" />首页</a></li>
<li><a href="#" />时光记忆</a></li>
<li><a href="#" />前行印迹</a></li>
<li><a href="#" />关于我</a></li>
</ul>
</div>
</body>
</html>
