我正在尝试实现 CSS 下拉菜单，但每当我这样做时，<h1>and<p>标签都会环绕下拉菜单框。
任何人都可以提出解决方案吗？我现在只是在学习 CSS，如果有任何意见，我将不胜感激。
谢谢
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<link rel="stylesheet" href="css.css"/>
</head>
<body>
<div id= "container">
<img src="images/title.jpg"/>
<div id="navigation">
<ul class="navbar">
<li>
<a href="#">Home</a>
</li>
<li>
<a href="#">HTML5</a>
<ul>
<li>
<a href="#">Tutorial 1</a>
</li>
<li>
<a href="#">Tutorial 2</a>
</li>
<li>
<a href="#">Tutorial 3</a>
</li>
</ul>
</li>
<li>
<a href="#">CSS3</a>
<ul>
<li>
<a href="#">Tutorial 1</a>
</li>
<li>
<a href="#">Tutorial 2</a>
</li>
<li>
<a href="#">Tutorial 3</a>
</li>
</ul>
</li>
<li>
<a href="#">Links</a>
</li>
<li>
<a href="#">Contact</a>
</li>
</ul>
</div>
<div id="content">
<h2>Home Page</h2>
<p>This is a test paragraph. This is a test paragraph. This is a test paragraph.
This is a test paragraph. This is a test paragraph. This is a test paragraph. This is a test paragraph. This is a test paragraph. This is a test paragraph. This is a test paragraph. This is a test paragraph. This is a test paragraph. This is a test paragraph.</p>
</div>
<div id="footer">
</div>
</div>
</body>
</html>
CSS是：
@charset "utf-8";
/* CSS Document */
#container{
width:800px;
background-color:#00FF00;
border:1px solid black;
height:1000px;
z-index:-9;
margin:auto;
}
#logo{
background-color:#FF0033;
border:#000 1px;
width:800px;
height:200px;
overflow:hidden;
}
#navigation{
background-color:#FFF;
border:#000 1px;
width:800px;
height:30px;
}
#content{
background-color:#6F3;
border:#000 1px;
width:780px;
height:400px;
margin:10px;
}
#footer{
background-color:#FF0;
border:#000 1px;
width:800px;
height:100px;
}
.navbar {
/*border-right: 1px solid #54879D;*/
height: 40px;
margin: 0 0 0 0;
padding: 0;
}
.navbar li {
background-color: #366B82;
float: left;
font: bold 12px/1.2em Arial,Verdana,Helvetica;
height: auto;
list-style: none outside none;
margin: 20 0;
padding: 0;
text-align: center;
width: 160px;
}
.navbar a {
/* border-left: 1px solid #54879D;*/
border-right: 1px solid #1F5065;
color: #FFFFFF;
display: block;
padding: 10px 10px;
text-decoration: none;
}
.navbar li:hover, a:hover {
background-color: #54879D;
}
.navbar li ul {
display: none;
height: auto;
margin: 0;
padding: 0;
}
.navbar li:hover ul {
display: block;
}
.navbar li ul li {
background-color: #54879D;
}
.navbar li ul li a {
border-color: #74A3B7 #1F5065 #1F5065;
border-left: 1px solid #1F5065;
border-right: 1px solid #1F5065;
border-style: solid;
border-width: 1px;
}
.navbar li ul li a:hover {
background-color: #366B82;
}