Question

我想更改引导导航栏的背景颜色。

这就是现在的样子。

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>

Answer 1

删除bg-light类，并为navbar类设置所需的任何颜色。请注意，bg-light的值具有！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>

Answer 2

您的导航栏背景颜色符合!important规则：

.bg-light {
    background-color: #f8f9fa!important;
}

您可以尝试使用另一个!important CSS规则（但具有更长的CSS路径）覆盖该值。这样，您的!important规则将优先于第一个!important规则。

类似的东西：

.navbar.bg-light {
    background-color: {your-desired-color} !important;
}

P.S。我不会说这是一个不好的做法，但是如果不确定为什么要使用!important规则，就应该避免使用它。因此，如果您可以编辑HTML，只需从bg-light元素中删除<nav>类，就可以在没有!important的情况下为其更改颜色。

Answer 3

您更改bg-light bg-light2并输入所需的颜色。

.bg-light2{background-color:red }a.bg-light2:focus,a.bg-light2:hover,button.bg-light2:focus,button.bg-light2:hover{background-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>

我想更改Bootstrap导航栏的背景颜色。

3 个答案: