我想更改 Bootstrap 导航栏的背景颜色。 [复制]
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【中文标题】我想更改 Bootstrap 导航栏的背景颜色。 [复制]【英文标题】：I want to change the background-color of my Bootstrap navigation bar. [duplicate] 【发布时间】：2019-04-28 14:33:56 【问题描述】：我想更改引导导航栏的背景颜色。
目前是这样的。
我使用的 html 代码。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Complete Bootstrap 4 Website Layout</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="https://use.fontawesome.com/releases/v5.0.8/js/all.js"></script>
<link href="style.css" rel="stylesheet">
</head>
<body>
<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="index.html"><img src="img/logo.png"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavAltMarkup">
<!--'ml-auto' puts the navigation buttons to the right hand side when it is on a medium screen-->
<div class="navbar-nav ml-auto">
<a class="nav-item nav-link active" href="index.html">Home <span class="sr-only">(current)</span></a>
<a class="nav-item nav-link" href="#">About</a>
<a class="nav-item nav-link" href="#">Services</a>
<a class="nav-item nav-link disabled" href="#">Team</a>
<a class="nav-item nav-link disabled" href="#">Connect</a>
</div>
</div>
</nav>【问题讨论】：
【参考方案1】：删除bg-light 类并将您想要的任何颜色设置为navbar 类。请注意，bg-light 的值中有 !important，这意味着它将覆盖不重要的属性。您可以将内联样式与 ~important 一起使用，它也可以解决问题，但不是一个好习惯。
.navbar
background-color: #bada55 !important;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Complete Bootstrap 4 Website Layout</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="https://use.fontawesome.com/releases/v5.0.8/js/all.js"></script>
<link href="style.css" rel="stylesheet">
</head>
<body>
<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-light">
<a class="navbar-brand" href="index.html"><img src="img/logo.png"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavAltMarkup">
<!--'ml-auto' puts the navigation buttons to the right hand side when it is on a medium screen-->
<div class="navbar-nav ml-auto">
<a class="nav-item nav-link active" href="index.html">Home <span class="sr-only">(current)</span></a>
<a class="nav-item nav-link" href="#">About</a>
<a class="nav-item nav-link" href="#">Services</a>
<a class="nav-item nav-link disabled" href="#">Team</a>
<a class="nav-item nav-link disabled" href="#">Connect</a>
</div>
</div>
</nav>【讨论】：
【参考方案2】：您的导航栏背景颜色在!important 规则下：
.bg-light
background-color: #f8f9fa!important;
您可以尝试使用另一个 !important css 规则覆盖该值，但 css 路径更长。这样，您的 !important 规则将优先于第一个 !important 规则。
类似：
.navbar.bg-light
background-color: your-desired-color !important;
附：我不会说这是一个不好的做法，但是如果您不确定为什么要使用它，应该避免使用 !important 规则。因此，如果您可以编辑 HTML，只需从 <nav> 元素中删除 bg-light 类，您就可以在没有 !important 的情况下更改它的颜色。
【讨论】：
【参考方案3】：你改变bg-lightbg-light2并写下你想要的颜色。
.bg-light2background-color:red a.bg-light2:focus,a.bg-light2:hover,button.bg-light2:focus,button.bg-light2:hoverbackground-color:#dae0e5<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Complete Bootstrap 4 Website Layout</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="https://use.fontawesome.com/releases/v5.0.8/js/all.js"></script>
<link href="style.css" rel="stylesheet">
</head>
<body>
<!-- Navigation -->
<nav class="navbar navbar-expand-lg navbar-light bg-light2">
<a class="navbar-brand" href="index.html"><img src="img/logo.png"></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavAltMarkup">
<!--'ml-auto' puts the navigation buttons to the right hand side when it is on a medium screen-->
<div class="navbar-nav ml-auto">
<a class="nav-item nav-link active" href="index.html">Home <span class="sr-only">(current)</span></a>
<a class="nav-item nav-link" href="#">About</a>
<a class="nav-item nav-link" href="#">Services</a>
<a class="nav-item nav-link disabled" href="#">Team</a>
<a class="nav-item nav-link disabled" href="#">Connect</a>
</div>
</div>
</nav>【讨论】：
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