我在导航栏和页面顶部的<h1>标题之间有一个恼人的空间，我似乎无法摆脱它。我试过了.navbar { margin-bottom: 0; }和section#title-bar { margin-top: 0; }。但是，差距并没有消失。我正在使用bootstrap 4。
这是我的代码：
body {
background: #FFF;
padding-top: 4rem; }
body .navbar {
margin-bottom: 0px; }
body .green-text {
color: #1CAA98 !important; }
body .jumbotron {
background: url(../img/site_showcase_bg.jpg) no-repeat top center;
color: #FFF;
height: 500px;
overflow: none; }
body .jumbotron img.app-btn {
width: 40%;
margin-right: 30px;
display: inline; }
body .jumbotron h1 {
margin-top: 60px; }
body .jumbotron p {
margin-bottom: 40px; }
body .jumbotron img.showCase-img {
max-width: 100%; }
body section#middle {
padding: 10px 0 40px 0; }
body section#middle img.demo-1 {
width: 100%;
padding: 3px;
border: 1px solid #CCC; }
body section#middle img.demo-2 {
width: 100%;
padding: 3px;
border: 1px solid #CCC; }
body section#middle img.demo-3 {
width: 100%;
padding: 3px;
border: 1px solid #CCC; }
body section#feature {
background: #1CAA98;
color: #FFF;
padding: 40px;
overflow: auto; }
body section#feature ul li {
font-size: 22px;
list-style: none; }
body section#feature .big-logo {
width: 100%; }
body section#title-bar {
height: 80px;
background: #1CAA98;
color: #FFF;
padding: 0;
margin: 0; }
body footer {
background: #333;
color: #FFF;
padding: 30px 0 20px 0; }
body footer li {
float: left;
padding: 0 10px 0 10px;
list-style: none; }
body footer a {
color: #FFF; }
body footer p {
float: right; }<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet"/>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Adding Font Awesome icons to the app -->
<script src="https://use.fontawesome.com/7333e518d7.js"></script>
<title>Gamma: About</title>
<!-- Bootstrap core CSS -->
<link href="./css/bootstrap.css" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="./css/styles.css" rel="stylesheet">
</head>
<body>
<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
<a class="navbar-brand green-text" href="#">Gamma</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="navbar-nav mr-auto">
<li class="nav-item">
<a class="nav-link" href="index.html">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item active">
<a class="nav-link" href="about.html">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contact.html">Contact</a>
</li>
</ul>
</div>
</nav>
<section id="title-bar">
<div class="container">
<div class="row">
<div class="col-md-12">
<h1>About Gamma</h1>
</div>
</div>
</div>
</section>
</body>
</html>
也许我忽视了一些事情。任何帮助表示赞赏。
答案 0 :(得分：0)
这是由于padding-top: 4em;上的body，您需要使用56px（导航栏的高度），例如：
body {
padding-top: 56px; // Height of the navbar
}
请看下面的代码段：
body {
background: #FFF;
padding-top: 56px; }
body .navbar {
margin-bottom: 0px; }
body .green-text {
color: #1CAA98 !important; }
body .jumbotron {
background: url(../img/site_showcase_bg.jpg) no-repeat top center;
color: #FFF;
height: 500px;
overflow: none; }
body .jumbotron img.app-btn {
width: 40%;
margin-right: 30px;
display: inline; }
body .jumbotron h1 {
margin-top: 60px; }
body .jumbotron p {
margin-bottom: 40px; }
body .jumbotron img.showCase-img {
max-width: 100%; }
body section#middle {
padding: 10px 0 40px 0; }
body section#middle img.demo-1 {
width: 100%;
padding: 3px;
border: 1px solid #CCC; }
body section#middle img.demo-2 {
width: 100%;
padding: 3px;
border: 1px solid #CCC; }
body section#middle img.demo-3 {
width: 100%;
padding: 3px;
border: 1px solid #CCC; }
body section#feature {
background: #1CAA98;
color: #FFF;
padding: 40px;
overflow: auto; }
body section#feature ul li {
font-size: 22px;
list-style: none; }
body section#feature .big-logo {
width: 100%; }
body section#title-bar {
height: 80px;
background: #1CAA98;
color: #FFF;
padding: 0;
margin: 0; }
body footer {
background: #333;
color: #FFF;
padding: 30px 0 20px 0; }
body footer li {
float: left;
padding: 0 10px 0 10px;
list-style: none; }
body footer a {
color: #FFF; }
body footer p {
float: right; }<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet"/>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<!-- Adding Font Awesome icons to the app -->
<script src="https://use.fontawesome.com/7333e518d7.js"></script>
<title>Gamma: About</title>
<!-- Bootstrap core CSS -->
<link href="./css/bootstrap.css" rel="stylesheet">
<!-- Custom styles for this template -->
<link href="./css/styles.css" rel="stylesheet">
</head>
<body>
<nav class="navbar navbar-expand-md navbar-dark bg-dark fixed-top">
<a class="navbar-brand green-text" href="#">Gamma</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="navbar-nav mr-auto">
<li class="nav-item">
<a class="nav-link" href="index.html">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item active">
<a class="nav-link" href="about.html">About</a>
</li>
<li class="nav-item">
<a class="nav-link" href="contact.html">Contact</a>
</li>
</ul>
</div>
</nav>
<section id="title-bar">
<div class="container">
<div class="row">
<div class="col-md-12">
<h1>About Gamma</h1>
</div>
</div>
</div>
</section>
</body>
</html>
希望这有帮助！
答案 1 :(得分：0)
您需要从h1标记本身移除上边距，并从navbar-nav ul列表中删除下边距，默认浏览器样式。