html css dropdown menu | 易学教程

问题

This is my first ever post to Stack Overflow and I'm not familiar with forum regulations with posting. So please let me know anything that I have done wrong. I have researched this issue in the forums and nothing I've come across gives me a clear answer.

I am trying to create a dropdown menu from the "News" element, but I never get any visible result when running the code. I tried to change the .dropdown-content's display value to block to see if it would make the list visible, but nothing showed. What am I missing?

body{
	background-image: url("images/seamless-panda-bear-pattern.jpg");
	font-size: 100%;
	width: 80%;
	margin: auto;
	font-family: Palatino,"Palatino", Arial;

}

#top{
	background-color: black;
	color: white;
	padding-left: 10px;
	border: 2px solid white;
	font-family: Copperplate,"Copperplate Gothic Light",fantasy;
	opacity: 0.85;
	padding-left: 25px;
}

#menu{
	list-style-type: none;
	margin: 0;
	padding: 0;
	overflow: hidden;
	background-color: #333;
	position: fixed;
	width: 80%;
}
li{
	float: left;
}

#login{
	float: right;
	padding-right: 20px;
}

li a{
	display: block;
	color: white;
	text-decoration: none;
	text-align: center;
	padding: 14px 16px;

}
li a:hover{
	background-color: white;
	color: black;
}

li.dropdown{
	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);
	padding: 12px 16px;
	z-index: 1;
}

.dropdown-content a{
	display: block;
	text-decoration: none;
	padding: 12px 16px;
	color: black;
}

.dropdown:hover .dropdown-content{
	display: block;
}


#bio{

}

#bottom{

}

<div id="nav">
<ul style="list-style-type: none" id="menu">
	<li><a href="home.html">Home</a></li>
	<li class="dropdown"><a class="dropbtn" href="#">News</a>
		<div class="dropdown-content">
			<a href="#">Games</a>
			<a href="#">Web Design</a>
			<a href="#">Travel</a>
		</div>
	</li>
	<!-- create a link to a part of the same page for contact info -->
	<li><a href="#bottom">Contact info</a></li>
	<li id="login"><a href="login.html">Log In</a></li>
</ul>
</div>

回答1:

To solve your position fixed issue. You can add position: fixed; to #nav and change the width on #menu from width: 80%; to width: 100%;

Here's a JS Fiddle.

Hope that helped!

来源：https://stackoverflow.com/questions/36784070/html-css-dropdown-menu

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dropdown