下拉菜单不起作用。它只是向我展示里面<li>的东西

Question

我试图制作一个下拉菜单，但我不知道为什么，它不起作用。它只是向我展示<li>内部的内容

这是下拉的CSS

a, a:visited {
text-decoration:none;
outline:none;
color:#54a6de;
}
a:hover{
text-decoration:underline;
}
section, footer, nav{
display: block;
}

/*----------------------------
The Navigation Menu
-----------------------------*/

#colorNav > ul{
width: 450px; /* Increase when adding more menu items */
margin:0 auto;
}
#colorNav > ul > li{ /* will style only the top level li */
list-style: none;
box-shadow: 0 0 10px rgba(100, 100, 100, 0.2) inset,1px 1px 1px #CCC;
display: inline-block;
line-height: 1;
margin: 1px;
border-radius: 3px;
position:relative;
}
#colorNav > ul > li > a{
color:inherit;
text-decoration:none !important;
font-size:24px;
padding: 25px;
}
#colorNav li ul{
position:absolute;
list-style:none;
text-align:center;
width:180px;
left:50%;
margin-left:-90px;
top:70px;
font:bold 12px 'Open Sans Condensed', sans-serif;

/* This is important for the show/hide CSS animation */
max-height:0px;
overflow:hidden;

-webkit-transition:max-height 0.4s linear;
-moz-transition:max-height 0.4s linear;
transition:max-height 0.4s linear;
}
#colorNav li ul li{
background-color:#313131;
}
#colorNav li ul li a{
padding:12px;
color:#fff !important;
text-decoration:none !important;
display:block;
}
#colorNav li ul li:nth-child(odd){ /* zebra stripes */
background-color:#363636;
}
#colorNav li ul li:hover{
background-color:#444;
}
#colorNav li ul li:first-child{
border-radius:3px 3px 0 0;
margin-top:25px;
position:relative;
}
#colorNav li ul li:first-child:before{ /* the pointer tip */
content:'';
position:absolute;
width:1px;
height:1px;
border:5px solid transparent;
border-bottom-color:#313131;
left:50%;
top:-10px;
margin-left:-5px;
}
#colorNav li ul li:last-child{
border-bottom-left-radius:3px;
border-bottom-right-radius:3px;
}
/* This will trigger the CSS */
/* transition animation on hover */
#colorNav li:hover ul{
max-height:200px; /* Increase when adding more dropdown items */
}

/*----------------------------
Color Themes
-----------------------------*/

#colorNav li.green{
/* This is the color of the menu item */
background-color:#00c08b;

/* This is the color of the icon */
color:#127a5d;
}
#colorNav li.blue{      background-color:#53bfe2;color:#2884a2;}

这是HTML代码：

<nav id="colorNav">
<ul>
<li class="blue">
<a href="#" class="fa fa-cogs"></a>
<ul>
<li><a href="#">Dropdown item 1</a></li>
<li><a href="#">Dropdown item 2</a></li>
<li><a href="#">Dropdown item 2</a></li>
<li><a href="#">Dropdown item 2</a></li>
</ul>
</li>
</ul>
</nav>

它看起来是这样的：https://i.stack.imgur.com/v3hrH.jpg

Answer 1

您应该设置为不显示li下拉列表，并在悬停到标签a时添加CSS，然后显示阻止它。