如何更改导航栏文本后面的背景颜色和高度？
[英]How can I change the colour and height of the background behind the navigation bar text?
问题描述
I was wondering how I can change colour and height of the background behind the navigation bar text? 
我想知道如何更改导航栏文本后面的背景颜色和高度？ I'm aware I have to use CSS. 我知道我必须使用CSS。 However, I'm not sure of what class I have to pick from the html. 但是，我不确定我必须从html中选择哪个类。 Here is my codepen . 这是我的codepen 。
Furthermore, I have listed my HTML code of the navigation bar below. 此外，我在下面列出了导航栏的HTML代码。
<body>
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#"><img src="http://placehold.it/60x60" alt="Your Brand Name"></a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">Home</a>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true">About Me <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a>
</li>
<li><a href="#">Another action</a>
</li>
<li><a href="#">Something else here</a>
</li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a>
</li>
<li role="separator" class="divider"></li>
<li><a href="#">One more separated link</a>
</li>
</ul>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Units <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a>
</li>
<li><a href="#">Another action</a>
</li>
<li><a href="#">Something else here</a>
</li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a>
</li>
<li role="separator" class="divider"></li>
<li><a href="#">One more separated link</a>
</li>
</ul>
</li>
<li><a href="#">Clients</a>
</li>
<li><a href="#contact-me">Contact Me</a>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
CSS code below. 下面的CSS代码。 (Could the issue be of the bootstrap method of the styling sheet?) （问题可能出在样式表的引导方法上吗？）
<style>
body {
margin: 0;
padding: 0;
}
navbar-header {
height: 15vh;
background-color: #4D5061;
}
nav ul {
list-style-type: none;
text-align: center;
}
nav ul li {
display: inline-block;
}
nav ul li a {
display: inline-block;
padding: 3.5vh 8px 4px;
color: white;
text-decoration: none;
font-size: 14pt;
font-family: 'Roboto', sans-serif;
}
nav ul li:after {
content: '';
position: absolute;
right: 50%;
bottom: 0;
left: 50%;
height: 3px;
background-color: red;
border-radius: 9px;
transition:all .2s;
}
nav ul li:hover:after {
right: 0;
left: 0;
}
a:hover {
color:red;
text-decoration:none;
}
#logo {
padding-top: 2vh;
padding-left: 20px;
float: left;
}
section {
position: relative;
}
.section1 {
height: 93vh;
background-color: #FFFFFF;
text-align: center;
}
.section2 {
height: 93vh;
background-color: #A59E8C;
text-align: center;
color: white;
}
.contact_section {
height: 93vh;
background-color: grey;
}
.logo {
color: #000000;
font-size: 200px;
}
.fa-angle-down {
color: #4D5061;
position: absolute;
bottom: 0px;
}
footer {
height: 10vh;
}
</style>
Kind Regards, Liam. 亲切的问候，利亚姆。
2 个解决方案
解决方案1
1 已采纳 2017-03-04 20:43:56
.navbar.navbar-default will target it with your existing markup and with enough specificity to override bootstrap's default styling. .navbar.navbar-default将使用您现有的标记作为目标，并具有足够的特异性以覆盖bootstrap的默认样式。
.navbar.navbar-default {
background: red;
min-height: 200px;
}
解决方案2
0 2017-03-04 20:32:44
您可以使用“ .navbar span”选择器，它应该应用于导航栏中的所有span标签。如果只想选择特定的span标签，则可以在我上面为类编写的选择器中更改“ span”您要修改的span标签的名称，让我知道它是否有效
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