我是HTML / CSS的新手，我正在尝试在无序列表中选择一个特定类来进行样式化。
我希望能够在CSS中选择HTML代码：<li class="nav-header"><a href="#">WOMEN'S WEAR</a></li>。
我尝试使用.dropdown-header:nth-child(2)选择代码，以便width从110px更改为150px，但没有任何反应。
` 这是完整的代码：
HTML：
<nav class="navigation">
<ul>
<li class="nav-header"><a href="#">MEN'S WEAR</a>
<ul class="dropdown-background">
<li class="dropdown-header"><a href="#">TOPWEAR</a>
<ul>
<li><a class="browse" href="#">Jackets & Coats</a></li>
<li><a class="browse" href="#">Shirts</a></li>
<li><a class="browse" href="#">Overshirts</a></li>
<li><a class="browse" href="#">T-Shirts</a></li>
<li><a class="browse" href="#">Basic T-Shirts</a></li>
<li><a class="browse" href="#">Knitwear</a></li>
<li><a class="browse" href="#">Sweats</a></li>
</ul>
</li>
<li class="dropdown-header"><a href="#">BOTTOMWEAR</a>
<ul>
<li><a class="browse" href="#">Jeans</a></li>
<li><a class="browse" href="#">Colour Jeans</a></li>
<li><a class="browse" href="#">Pants</a></li>
<li><a class="browse" href="#">Shorts</a></li>
</ul>
</li>
<li class="dropdown-header"><a href="#">FOOTWEAR</a>
<ul>
<li><a class="browse" href="#">Boots</a></li>
<li><a class="browse" href="#">Sandals</a></li>
<li><a class="browse" href="#">Shoes</a></li>
<li><a class="browse" href="#">Snickers</a></li>
</ul>
</li>
<li class="dropdown-header"><a href="#">ACCESSORIES</a>
<ul>
<li><a class="browse" href="#">Belts</a></li>
<li><a class="browse" href="#">Caps</a></li>
<li><a class="browse" href="#">Hats</a></li>
<li><a class="browse" href="#">Scarves</a></li>
<li><a class="browse" href="#">Gloves</a></li>
<li><a class="browse" href="#">Sunglasses</a></li>
<li><a class="browse" href="#">Watches</a></li>
<li><a class="browse" href="#">Jewelry</a></li>
</ul>
</li>
<li class="dropdown-header"><a href="#">SALE</a>
<ul>
<li><a class="browse" href="#">Jackets & Coats</a></li>
<li><a class="browse" href="#">Shirts</a></li>
<li><a class="browse" href="#">Overshirts</a></li>
<li><a class="browse" href="#">T-Shirts</a></li>
<li><a class="browse" href="#">Basic T-Shirts</a></li>
<li><a class="browse" href="#">Knitwear</a></li>
<li><a class="browse" href="#">Sweats</a></li>
</ul>
</li>
</ul>
</li>
</ul>
<ul>
<li class="nav-header"><a href="#">WOMEN'S WEAR</a>
<ul class="dropdown-background">
<li class="dropdown-header"><a href="#">TOPWEAR</a>
<ul>
<li><a class="browse" href="#">Jackets & Coats</a></li>
<li><a class="browse" href="#">Shirts</a></li>
<li><a class="browse" href="#">Overshirts</a></li>
<li><a class="browse" href="#">T-Shirts</a></li>
<li><a class="browse" href="#">Basic T-Shirts</a></li>
<li><a class="browse" href="#">Knitwear</a></li>
<li><a class="browse" href="#">Sweats</a></li>
</ul>
</li>
<li class="dropdown-header"><a href="#">BOTTOMWEAR</a>
<ul>
<li><a class="browse" href="#">Jeans</a></li>
<li><a class="browse" href="#">Colour Jeans</a></li>
<li><a class="browse" href="#">Pants</a></li>
<li><a class="browse" href="#">Shorts</a></li>
</ul>
</li>
<li class="dropdown-header"><a href="#">FOOTWEAR</a>
<ul>
<li><a class="browse" href="#">Boots</a></li>
<li><a class="browse" href="#">Sandals</a></li>
<li><a class="browse" href="#">Shoes</a></li>
<li><a class="browse" href="#">Snickers</a></li>
</ul>
</li>
<li class="dropdown-header"><a href="#">ACCESSORIES</a>
<ul>
<li><a class="browse" href="#">Belts</a></li>
<li><a class="browse" href="#">Caps</a></li>
<li><a class="browse" href="#">Hats</a></li>
<li><a class="browse" href="#">Scarves</a></li>
<li><a class="browse" href="#">Gloves</a></li>
<li><a class="browse" href="#">Sunglasses</a></li>
<li><a class="browse" href="#">Watches</a></li>
<li><a class="browse" href="#">Jewelry</a></li>
</ul>
</li>
<li class="dropdown-header"><a href="#">SALE</a>
<ul>
<li><a class="browse" href="#">Jackets & Coats</a></li>
<li><a class="browse" href="#">Shirts</a></li>
<li><a class="browse" href="#">Overshirts</a></li>
<li><a class="browse" href="#">T-Shirts</a></li>
<li><a class="browse" href="#">Basic T-Shirts</a></li>
<li><a class="browse" href="#">Knitwear</a></li>
<li><a class="browse" href="#">Sweats</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</nav>
CSS：
/* ------------------ NAVIGATION BAR ------------------ */
.navigation {
position: relative;
background-color: #f5f5f5;
width: 1024px;
height: 42px;
margin: 0 auto;
border-bottom: 1px solid #ddd;
-webkit-font-smoothing:antialiased;
}
.navigation a {
-webkit-transition: all .25s ease;
-moz-transition: all .25s ease;
-ms-transition: all .25s ease;
-o-transition: all .25s ease;
transition: all .25s ease;
}
.nav-header:nth-child(1) {
width: 110px;
height: 30px;
float: left;
padding-top: 13px;
padding-left: 10px;
list-style: none;
position: relative;
font-weight: bold;
-webkit-transition: all .25s ease;
-moz-transition: all .25s ease;
-ms-transition: all .25s ease;
-o-transition: all .25s ease;
transition: all .25s ease;
}
.nav-header:hover {
background: #000;
}
.nav-header ul {
position: relative;
overflow: hidden;
visibility: hidden;
top: 14px;
opacity: 0;
z-index: 1;
-webkit-transition: all .25s ease;
-moz-transition: all .25s ease;
-ms-transition: all .25s ease;
-o-transition: all .25s ease;
transition: all .25s ease;
}
.nav-header:hover ul {
visibility: visible;
opacity: 1;
}
.nav-header a {
text-decoration: none;
color: #000;
}
.nav-header:hover a{
color: #fff;
}
.dropdown-background {
background: #000;
width: 1024px;
height: 265px;
right: 10px;
}
.dropdown-header {
position: relative;
float: left;
top: 10px;
}
.dropdown-header a {
padding-right: 60px;
color: #fff;
padding-left: 10px;
}
.dropdown-header a:hover {
text-decoration: underline;
}
.browse {
font-weight: normal;
font-size: 12px;
line-height: 25px;
}
.browse:hover {
text-decoration: underline;
}
答案 0 :(得分：2)
让我们应用这种伪元素样式。
nav ul:nth-of-type(2) > li.nav-header
{
width:150px;
}
这样就可以了。这是一个工作演示。 http://jsbin.com/suxumefe/1/
答案 1 :(得分：1)
HTML
<!--in html code add id-->
<li class="nav-header" id="womans-wear"><a href="#">WOMEN'S WEAR</a>
<!--end html-->
CSS
#womans-wear{
/*add your styles in here*/
width:150px;
}
根据上述评论
中的解释，这样的事情答案 2 :(得分：0)
以下内容可行：
.navigation ul:nth-of-type(2) > .nav-header a {
width: 150px;
}
虽然应该注意，如果您可以将类添加到您要定位的第二个ul，请添加它以使您的样式适用于do not support nth-of-type的浏览器。此外，由于创建过于具体且难以覆盖的选择器，many CSS authorities不首选使用ID而不是类。