让我继续说，我已经搜索了 Google 和 Stack Overflow 来找到这个问题的答案。我尝试了很多解决方案，但没有一个有效。
现在的主要问题是我的 CSS 不会覆盖超大屏幕中的 Bootstrap CSS。它不会更改背景颜色、背景图像或导航栏设置。
我试过使用 !important。在调用 Bootstrap 之后，我尝试调用我的样式表。在我当前的版本中，我有 @import 代码来在我自己的 CSS 文件的开头调用 Bootstrap CSS。没有一个有效。对于一些元素，我更改了 Bootstrap 文件，但仅针对颜色。
请帮我弄清楚为什么我的文件不会覆盖 Bootstrap 。您可以在 http://www.dismantledesign.com/testsite2/ 查看该站点
网站不完整。在弄清楚这一点之前，我无法继续进行造型。
如果有任何代码最终丢失，我们深表歉意。所以并不总是喜欢我来自 TextWrangler 的粘贴。随意通过链接中的源代码查看它。
代码如下:
@import url("bootstrap.min.css");
body{
font-family: 'Raleway', Helvetica, Arial;
font-size: 16px;
color: #666666;
font-weight: 400;
letter-spacing: 1px;
}
p{
line-height: 20pt;
font-weight: 400;
}
h1, h2, h3, h4, h5, h6{
color: #333333;
text-transform: uppercase;
font-family: 'Raleway', Helvetica, Arial;
font-weight: 700;
}
a{
color: #00acec;
text-decoration: none;
font-family: 'Raleway', Helvetica, Arial;
font-weight: 600;
}
a:hover, a:focus{
color: #5a5e61;
text-decoration: none;
}
.btn-default{
border-radius: 2px;
border: 1px solid #a7adb0;
font-size: 14px;
color: #a7adb0;
font-weight: 700;
text-transform: uppercase;
padding: 11px 20px;
}
.btn-default:hover{
background: #5a5e61;
color: #a7adb0;
}
/*end*/
/*logo*/
.navbar-brand{
width: 174px;
height: 50px;
padding: 0;
margin: 0;
text-indent: -9999px;
}
/*end*/
/*navigation*/
.navbar-default{
background: none;
border: none;
padding: 0 0 60px 0;
}
.navbar-default .navbar-nav>li>a{
font-size: 20px;
font-weight: 600;
text-transform: uppercase;
color: #a7adb0;
padding: 11px 0;
text-align: center;
}
.navbar-default .navbar-nav>li>a:hover[
color: #fff;
}
.navbar-default .navbar-nav>.active>a, .navbar-default .navbar-nav>.active>a:focus, .navbar-default .navbar-nav>.active>a:hover{
background: none;
outline: 0;
color: #fff;
}
.navbar-toggle{
border: none;
margin-top: 0;
margin-right: 0;
width:32px;
height: 32px;
text-align: center;
}
.navbar-default .navbar-collapse{
border: none;
background: rgba(0,0,0,0.1) !important;
border-radius: 2px;
box-shadow: none;
}
.jumbotron{
background: #363737 url("img/tempjumbotron.jpg") no-repeat;
background-size: cover;
max-height: 800px;
padding: 60px 0;
margin: 0;
}
/*end*/
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<!--Hey, this is the CC title!-->
<title>Contra Coda Media | Audio | Photo | Video</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<!--This is where the CSS comes from. -->
<link href="https://fonts.googleapis.com/css?family=Raleway" rel="stylesheet">
<link href="css/style.css" rel="stylesheet">
</head>
<body>
<div class="jumbotron">
<div class="container">
<nav class="navbar navbar-default" role="navigation">
<!-- Brand and toggle get grouped for better mobile display-->
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse">
<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="img/logo5.png"></a>
</div>
<!-- Collect Nav Content -->
<div class="collapse navbar-collapse navbar-ex1-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Services</a></li>
<li><a href="#">Gallery</a></li>
<li><a href="#">Contact</a></li>
</ul>
</div><!--END NAVBAR COLLAPSE-->
</nav>
<div class="row text-center">
<h1>THIS IS CONTRA CODA</h1>
<h3>where the music never ends</h3>
<a href="#" class="btn btn-primary btn-lg">LEARN MORE</a>
</div>
</div>
</div>
<!--END JUMBOTRON-->
<div class="whatsnew">
<div id="carousel-example-generic" class="carousel slide" data-ride="carousel">
<!-- Wrapper for slides -->
<div class="carousel-inner" role="listbox">
<div class="item active">
<img class="img-responsive" src="img/levelup.jpg" alt="">
</div>
<div class="item">
<img class="img-responsive" src="img/heartwhole.jpg" alt="">
</div>
</div>
</div>
</div>
<!--END WHATS NEW-->
<div class="services">
<div class="container">
<div class="row">
<div class="services-audio text-center">
<div class="col-md-4">
<span style="font-size: 30px" class="glyphicon glyphicon-headphones"> </span>
<h4>AUDIO</h4>
<p>We believe in good, thoroughly crafted recording and mixing with great care in order to achieve a high-quality result.</p>
<a href="#" class="more">learn more</a>
</div>
</div>
<div class="services-photo text-center">
<div class="col-md-4">
<span style="font-size: 30px" class="glyphicon glyphicon-camera"> </span>
<h4>PHOTO</h4>
<p>We believe in good, thoroughly crafted recording with great care in order to achieve a high-quality result.</p>
<a href="#" class="more">learn more</a>
</div>
</div>
<div class="services-video text-center">
<div class="col-md-4">
<span style="font-size: 30px" class="glyphicon glyphicon-facetime-video"> </span>
<h4>VIDEO</h4>
<p>We believe in good, thoroughly crafted recording with great care in order to achieve a high-quality result.</p>
<a href="#" class="more">learn more</a>
</div>
</div>
</div>
</div>
</div>
<!--END SERVICES-->
<div class="clients">
<div class="heading">
<div class="container">
<div class="row">
<div class="col-md-6 text-center">
<h1>Clients</h1>
</div>
<div class="col-md-6 text-center">
<a href="#" class="btn btn-default">see more</a>
</div>
</div>
</div>
</div>
<!--END HEADING-->
<div class="gallery">
<!--GALLERY START-->
<div class="galleryinner">
<img src="img/clients/ivey.jpg" alt="" class="img-responsive" />
<div class="caption">
<div class="captionheading">
<h4>IVEY</h4>
<small>see more</small>
</div>
<div class="btn-group btn-trigger">
<a href="#" class="btn btn-default web-link">Link</a>
<a href="#" class="btn btn-default web-link">More</a>
</div>
</div>
<!--END CAPTION-->
</div>
<!--END GALLERY INNER-->
<div class="galleryinner">
<img src="img/clients/rufus.jpg" alt="" class="img-responsive" />
<div class="caption">
<div class="captionheading">
<h4>RUFUS DAWKINS</h4>
<small>see more</small>
</div>
<div class="btn-group btn-trigger">
<a href="#" class="btn btn-default web-link">Link</a>
<a href="#" class="btn btn-default web-link">More</a>
</div>
</div>
<!--END CAPTION-->
</div>
<!--END GALLERY INNER-->
<div class="galleryinner">
<img src="img/clients/seddymac.jpg" alt="" class="img-responsive" />
<div class="caption">
<div class="captionheading">
<h4>SEDDY MAC</h4>
<small>see more</small>
</div>
<div class="btn-group btn-trigger">
<a href="#" class="btn btn-default web-link">Link</a>
<a href="#" class="btn btn-default web-link">More</a>
</div>
</div>
<!--END CAPTION-->
</div>
<!--END GALLERY INNER-->
<div class="galleryinner">
<img src="img/clients/lomax.jpg" alt="" class="img-responsive" />
<div class="caption">
<div class="captionheading">
<h4>MELISSA LOMAX</h4>
<small>see more</small>
</div>
<div class="btn-group btn-trigger">
<a href="#" class="btn btn-default web-link">Link</a>
<a href="#" class="btn btn-default web-link">More</a>
</div>
</div>
<!--END CAPTION-->
</div>
<!--END GALLERY INNER-->
<div class="galleryinner">
<img src="img/clients/jeremy.jpg" alt="" class="img-responsive" />
<div class="caption">
<div class="captionheading">
<h4>JEREMY WILLIAMS</h4>
<small>see more</small>
</div>
<div class="btn-group btn-trigger">
<a href="#" class="btn btn-default web-link">Link</a>
<a href="#" class="btn btn-default web-link">More</a>
</div>
</div>
<!--END CAPTION-->
</div>
<!--END GALLERY INNER-->
<div class="galleryinner">
<img src="img/clients/echoing.jpg" alt="" class="img-responsive" />
<div class="caption">
<div class="captionheading">
<h4>WHEN ALL KEPT ECHOING</h4>
<small>see more</small>
</div>
<div class="btn-group btn-trigger">
<a href="#" class="btn btn-default web-link">Link</a>
<a href="#" class="btn btn-default web-link">More</a>
</div>
</div>
<!--END CAPTION-->
</div>
<!--END GALLERY INNER-->
<div class="galleryinner">
<img src="img/clients/delisle.jpg" alt="" class="img-responsive" />
<div class="caption">
<div class="captionheading">
<h4>RAISTLIN DELISLE</h4>
<small>see more</small>
</div>
<div class="btn-group btn-trigger">
<a href="#" class="btn btn-default web-link">Link</a>
<a href="#" class="btn btn-default web-link">More</a>
</div>
</div>
<!--END CAPTION-->
</div>
<!--END GALLERY INNER-->
</div>
<!--END GALLERY-->
</div>
<!---END CLIENTS-->
<div class="firstcontact">
<div class="container">
<div class="row">
<div class="col-md-4">
<div class="email text-center">
<span style="font-size: 30px" class="glyphicon glyphicon-envelope"> </span>
<h5>EMAIL</h5>
<p>layne@contracoda.com</p>
</div>
</div>
<div class="col-md-8">
<div class="social text-center">
<a href="#"><span class="icon-sprite sprite-ig"> </span></a>
<a href="#"><span class="icon-sprite sprite-fb"> </span></a>
<a href="#"><span class="icon-sprite sprite-twitter"> </span></a>
<a href="#"><span class="icon-sprite sprite-soundcloud"> </span></a>
</div>
</div>
</div>
</div>
</div>
<!---END FIRST CONTACT-->
<footer>
<div class="container">
<div class="row">
<div class="col-md-6 text-center">
<div class="copyright">
<small>© 2017 CONTRA CODA MEDIA</small>
</div>
</div>
<div class="col-md-6 text-center">
<div class="design">
<small>WEB DESIGN BY DISMANTLE DESIGN</small>
</div>
</div>
</div>
</div>
</footer>
<!---END CLIENTS-->
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script src="js/bootstrap.js"></script>
最佳答案
在第 82 行，您使用的是方括号 [ 而不是波浪线 {，将其交换即可:
.navbar-default .navbar-nav>li>a:hover {
这基本上使错误后的一切都不起作用，因此你的背景不会改变的原因 :) 你的背景图像也不会改变，除非它看起来像这样(第 110 行):
背景:#363737 url(../img/tempjumbotron.jpg) 不重复；
科达
关于html - 自定义 CSS 不会覆盖 Bootstrap ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/46143206/