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我是一名html初学者，我正在尝试开始在线投资组合工作，我已经设置了导航栏，现在我正在尝试从导航栏中创建一个下拉菜单。到目前为止，我还没有能够获得项目甚至进入下拉菜单，所以我想我没有正确设置容器。提前谢谢！HTML下拉菜单不起作用
/* nav bar */
body {
margin: 0;
padding: 0;
}
.nav ul {
list-style: none;
background-color: #444;
text-align: center;
padding: 15;
margin: 0;
}
.nav li {
font-family: 'Oswald', sans-serif;
font-size: 1.2em;
line-height: 40px;
height: 40px;
padding-right: 40px;
border-bottom: 1px solid #888;
}
.nav a {
text-decoration: none;
color: #fff;
display: block;
transition: .3s background-color;
}
.nav a:hover {
background-color: #005f5f;
}
.nav a.active {
background-color: #fff;
color: #444;
cursor: default;
}
@media screen and (min-width: 600px) {
.nav li {
width: 150px;
border-bottom: none;
height: 50px;
line-height: 50px;
font-size: 1.4em;
}
/* Option 1 - Display Inline */
.nav li {
display: inline-block;
margin-right: -4px;
}
/* Options 2 - Float
.nav li {
float: left;
}
.nav ul {
overflow: auto;
width: 600px;
margin: 0 auto;
}
.nav {
background-color: #444;
}
*/
/*****************************************************************/
/*Dropdown for portfolio tab */
/*****************************************************************/
/* Dropdown Button */
.dropbtn {
background-color: #4CAF50;
color: white;
padding: 16px;
font-size: 16px;
border: none;
cursor: pointer;
}
.dropdown {
position: relative;
display: inline-block;
}
.dropdown-content {
display: none;
position: absolute;
background-color: #f9f9f9;
min-width: 160px;
box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
}
.dropdown-content a {
color: black;
padding: 12px 16px;
text-decoration: none;
display: block;
}
.dropdown-content a:hover {background-color: #f1f1f1}
.dropdown:hover + .dropdown-content {
display: block;
}
.dropdown:hover .dropbtn {
background-color: #3e8e41;
}
<!DOCTYPE html>
<html>
<head>
\t <meta charset="UTF-8">
\t <META name="viewport" content="width=device-width, initial-scale=1">
<title> Will's Portfolio </title>
<link rel="stylesheet" href="dropdown.css">
<link href='http://fonts.gooleapis.com/css?family=Oswald'
rel='stylesheet' type='text/css'>
</head>
<body background = "http://2.bp.blogspot.com/-Xmo26BMqg5Q/UihlqVwTwgI/AAAAAAAAAv0/V-Rrgm0V6oo/s1600/Top+10+best+Simple+Awesome+Background+Images+for+Your+Website+or+Blog3.jpg">
<body class="About Me">
\t <header>
\t \t <div class="nav">
\t \t \t <ul>
\t \t \t
\t \t \t
\t \t \t
\t \t \t \t <li><a href="#">About Me</a></li> \t \t \t \t
\t \t \t \t \t \t
\t \t \t \t <li>
\t \t \t \t <div class="dropdown">
\t \t \t \t <button class="dropbtn">Portfolio</button>
\t \t \t \t <div class="dropdown-content">
\t \t \t \t \t <a href="#">Graphics</a>
\t \t \t \t \t <a href="#">Other</a>
\t \t \t \t \t
\t \t \t \t </div>
\t \t \t \t </div>
\t \t \t \t </li>
\t \t \t \t <li><a href="#"><nobr>Future Work</nobr></a></li>
\t \t \t </ul>
\t \t </div> \t
\t \t
\t </header>
</div>
\t \t
\t \t
</body>
</html>