大佬教程收集整理的这篇文章主要介绍了CSS 选择器对 h1 标签无效，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
我正在制作一个网站，它应该有一个大标题作为主要描述。我已将说明嵌入到 <h1> 标签中，并使用 CSS 使标签具有 Monsterrat 字体。但是无论我重新加载页面多少次，它都不起作用。
/******************** CLASS SELECTORS ********************/
.phone {
height: 500px;
wIDth: 550px;
height: auto;
margin-bottom: -120px;
}
/******************** ID SELECTORS ********************/
#title {
BACkground-@R_404_6004@: #2978b5;
}
/******************** TAG SELECTORS ********************/
h1 {
Font-family: 'Montserrat-Black',sans-serif;
Font-size: 3rem;
line-height: 1.5;
}<!DOCTYPE HTML>
<HTML>
<head>
<Meta charset="utf-8">
<title>Techno-Log</title>
<link rel="stylesheet" href="styles.CSS">
<!-- required Meta Tags -->
<Meta charset="utf-8">
<Meta name="vIEwport" content="wIDth=device-wIDth,initial-scale=1,shrink-to-fit=no">
<!-- bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/CSS/bootstrap.min.CSS" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmym81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.Js" integrity="sha384-q8i/X+965DzO0rT7abK41JstQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudFlare.com/AJAX/libs/popper.Js/1.14.3/umd/popper.min.Js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvcwpIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/Js/bootstrap.min.Js" integrity="sha384-ChfqqxuZUCnjsK3+MXmPNIyE6ZbWh2IMqE241rYiqJxymiZ6OW/JmZQ5stwEulTy" crossorigin="anonymous"></script>
</head>
<body>
<section ID="title">
<!-- Nav bar -->
<nav class="navbar navbar-expand-lg navbar-dark">
<a class="navbar-brand" href="">Techno-Log</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" ID="navbarSupportedContent">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="">Download</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">RevIEws</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Brands</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Pricing</a>
</li>
</ul>
</div>
</nav>
<!-- title -->
<div class="row">
<div class="col-lg-6">
<h1>Get the best technology updates and product news.</h1>
<button type="button">Download</button>
<button type="button">Download</button>
</div>
<div class="col-lg-6">
<img class="phone" src="https://specials-images.forbesimg.com/imageserve/5f8ebc300be77fed7b88aaf4/960x0.jpg?fit=scale" alt="iphone-mockup">
</div>
</div>
</section>
</body>
使用不同的类覆盖默认的 Bootstrap 字体
@import url('https://fonts.googleapis.com/css?family=Montserrat');
/******************** CLASS SELECTORS ********************/
.phone {
height: 500px;
width: 550px;
height: auto;
margin-bottom: -120px;
}
/******************** ID SELECTORS ********************/
#title {
BACkground-color: #2978b5;
}
/******************** TAG SELECTORS ********************/
h1 {
font-size: 3rem;
line-height: 1.5;
}
.montserrat{
font-family: 'Montserrat-Black',sans-serif;
}<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Techno-Log</title>
<link rel="stylesheet" href="styles.css">
<!-- required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,shrink-to-fit=no">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmym81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudFlare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxymiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
</head>
<body>
<section id="title">
<!-- Nav Bar -->
<nav class="navbar navbar-expand-lg navbar-dark">
<a class="navbar-brand" href="">Techno-Log</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="">Download</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Reviews</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Brands</a>
</li>
<li class="nav-item">
<a class="nav-link" href="">Pricing</a>
</li>
</ul>
</div>
</nav>
<!-- title -->
<div class="row">
<div class="col-lg-6">
<h1 class="montserrat">Get the best technology updates and product news.</h1>
<button type="button">Download</button>
<button type="button">Download</button>
</div>
<div class="col-lg-6">
<img class="phone" src="https://specials-images.forbesimg.com/imageserve/5f8ebc300be77fed7b88aaf4/960x0.jpg?fit=scale" alt="iphone-mockup">
</div>
</div>
</section>
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