当我将鼠标悬停在导航栏上时，我不知道如何摆脱侧面的栏。任何人都可以帮忙吗？我不想更改导航栏的外观或位置。我只想制作不受悬停影响的部分。
HTML：
<!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>
<link rel="stylesheet" type="text/css" href="style.css" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Simple Site</title>
</head>
<body>
<div id="container">
<div id="body">
<center>
<ul class="navbar">
<li><a href="index.html">Home</a></li>
<li><a href="about.html">About</a></li>
<li><a href="contact.html">Contact</a></li>
<li><a href="services.html">Services</a></li>
<li><a href="biography.html">Biography</a></li>
</ul>
</center>
</div>
</div>
</body>
</html>
CSS：
@charset "utf-8";
#container {
margin-left:auto;
margin-right:auto;
width:960px;
background-color:#666666;
}
#body {
background-color:#666666;
width:960px;
height:500px;
border:2px solid #FFFFFF;
margin-top:50px auto;
}
.navbar {margin:0px;
background-color:#66FF33;
text-align:center;
list-style:none;
border-bottom:none;
padding-left:0px
}
ul.navbar li {
width:19%;
display:inline-block;
}
ul.navbar a {
display:block;
width:100%;
margin:0px;
padding:10px 0px;
text-decoration:none;
}
ul.navbar a:hover {
background-color:#33FFD7;
}
body {
background-color:#333333;
}