Q1
如何让导航栏保持静态？
Q2
如何向上移动背景图片以确保没有白色间隙并调整背景图像的高度？我想我必须使用padding向上移动图片并使用height to manipulate the height of the background image。那是对的吗？
Q3
如何删除网页第3部分底部页脚文本上方的白色空白与我们联系？
HTML代码
<!DOCTYPE html>
<html>
<head>
<html lang="en">
<meta charset="UTF-8">
<title>Liam Docherty | London Web Developer & GFX designer</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<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="http://placehold.it/60x60" alt="Your Brand Name"></a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li><a href="#">Home</a>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true">About Me <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a>
</li>
<li><a href="#">Another action</a>
</li>
<li><a href="#">Something else here</a>
</li>
<li><a href="#">Separated link</a>
</li>
<li><a href="#">One more separated link</a>
</li>
</ul>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Units <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a>
</li>
<li><a href="#">Another action</a>
</li>
<li><a href="#">Something else here</a>
</li>
<li><a href="#">Separated link</a>
</li>
<li><a href="#">One more separated link</a>
</li>
</ul>
</li>
<li><a href="#">Clients</a>
</li>
<li><a href="#contact-me">Contact Me</a>
</li>
</ul>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
<section class="section1">
<div class="hero"></div>
<a href= "#section2"><i class="fa fa-angle-down" style="font-size:100px;"></i></a>
</section>
<section class="section2" id = "section2">
<a href = "#contact-me"> <i class="fa fa-angle-down" style="font-size:100px;"></i></a>
</section>
<section id="contact-me" class="contact_section">
</section>
<script src="https://code.jquery.com/jquery-3.1.1.js" integrity="sha256-16cdPddA6VdVInumRGo6IbivbERE8p7CQR3HzTBuELA=" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</body>
<footer>
<div class="page">
<h1 class="footer">Copyright © 2017 Liam Docherty's Site. All rights reserved.</h1>
</div>
</footer>
</html>
CSS
<style>
body {
margin: 0;
padding: 0;
}
.navbar.navbar-default {
background-color: #4D5061;
height: 10vh;
z-index: 100;
}
.navbar.navbar-default ul {
list-style-type: none;
text-align: center;
}
.navbar.navbar-default ul li {
display: inline-block;
}
.dropdown .dropdown-menu {
background-color: #4D5061;
}
.dropdown .dropdown-menu a {
color: white;
}
.navbar.navbar-default ul li a {
display: inline-block;
padding: 3.5vh 8px 4px;
color: white;
text-decoration: none;
font-size: 14pt;
font-family: 'Roboto', sans-serif;
}
.navbar.navbar-default ul li:after {
content: '';
position: absolute;
right: 50%;
bottom: 0;
left: 50%;
height: 3px;
background-color: red;
border-radius: 9px;
transition: all .2s;
}
.navbar.navbar-default ul li a:hover {
color: red;
}
.nav.navbar-nav,
.nav.navbar-nav>li {
float: none;
}
.navbar.navbar-default ul li:hover:after {
right: 0;
left: 0;
}
a:hover {
color: red;
text-decoration: none;
}
#logo {
padding-top: 2vh;
padding-left: 20px;
float: left;
}
section {
position: relative;
}
.section1 {
height: 90vh;
text-align: center;
color: white;
background-image: url("https://static.pexels.com/photos/48727/pexels-photo-48727.jpeg");
background-attachment: fixed;
}
.section2 {
height: 95vh;
background-color: #A59E8C;
text-align: center;
color: white;
}
.contact_section {
height: 93vh;
background-color: grey;
}
.fa-angle-down {
color: #4D5061;
position: absolute;
bottom: 0px;
}
footer {
height: 5vh;
background-color: #4D5061;
text-align: center;
margin:0;
padding:0;
right:0;
bottom:0;
left:0:
}
h1{
font-size: 14pt;
color: white;
font-family: 'Roboto', sans-serif;
}
.navbar.navbar-default ul.dropdown-menu li,
.navbar.navbar-default ul.dropdown-menu li a {
position: relative;
display: block;
}
</style>
答案 0 :(得分：0)
您需要将position:fixed添加到.navbar.navbar-default以修复此问题。另外，请务必添加width:100%以使其全宽。
（看看positioning） - Bootstrap可能会在课堂上定位，但我不确定。
关于底部的空白区域，我个人会从页脚中删除height:5vh，并将margin:0添加到H1元素。
答案 1 :(得分：0)
Bootstrap有nav-fixed类
<nav class="navbar navbar-default navbar-fixed-top">
....
</nav>
答案 2 :(得分：0)
1）使用Bootstrap提供的navbar-fixed-top类来固定导航栏。
2）更改section1类的高度属性。
3）创建一个新的部分，降低高度，并从你的h1类中删除边距/填充（你的CSS中有一个拼写错误，.footer而不是footer）。