所有 body 内容都在导航的上方和下方移动（HTML & CSS）
All body content moves up and below the navigation (HTML & CSS)
我已经尝试了一些建议，例如从 body 中删除溢出，将 z-index 添加到 header 和 padding-top，但似乎没有任何效果。
一开始它运行良好，但后来我实现了很多 Lorem Ipsum 文本。所有内容都只是在导航栏上下滑动。附上JS fiddle 说明一下
我尝试了整个 body 溢出并尝试了 fixed/relative header 位置。没有任何效果。
非常感谢任何意见。
我希望得到一些帮助，让我知道如何让导航条在向下滚动时不能真正保持固定。
当然还有如何让内容不水平溢出
请帮忙！
CSS
html,
body {
position: absolute;
width: 100%;
top: 0;
min-height: 100vh;
font-family: sans-serif;
margin: 0 !important;
padding: 0 !important;
}
ul {
box-sizing: border-box;
}
#logo {
max-width: 15%;
}
.menu-wrapper {
background-color: white;
}
.header {
z-index: 1000;
width: 100%;
margin: 1.2em;
position: fixed;
background-color: black;
}
#about {
position: absolute;
max-width: 100%;
top: 49%;
left: 50%;
transform: translate(-50%, -50%);
border: 5px solid purple;
padding: 20px;
text-align: center;
justify-content: center;
}
.about-par {
font-size: 1em;
}
.header ul {
padding: 0;
list-style: none;
overflow: hidden;
margin-right: 2em;
}
.header li a {
display: block;
color: blue;
text-decoration: none;
font-size: 1em;
}
.header li a:hover,
.header .menu-btn:hover {
color: black;
}
.header li a:active,
.header .menu-btn: active,
{
color: blue;
}
.header li a:active {
color: blue;
}
.header .logo {
color: black;
display: block;
float: left;
font-size: 1.1em;
padding: 12px;
margin-left: 1em;
text-decoration: none;
}
.header .menu {
clear: both;
max-height: 0;
transition: max-height 0.2s ease-out;
}
/* menu icon */
.header .menu-icon {
cursor: pointer;
display: inline-block;
float: right;
padding: 28px 40px;
position: relative;
user-select: none;
}
.header .menu-icon .navicon {
display: block;
height: 2px;
position: relative;
transition: background 0.2s ease-out;
width: 18px;
}
.header .menu-icon .navicon:before,
.header .menu-icon .navicon:after {
background: black;
content: "";
display: block;
height: 100%;
position: absolute;
transition: all 0.2s ease-out;
width: 100%;
}
.header .menu-icon .navicon:before {
top: 5px;
}
.header .menu-icon: before {
background: transparent;
}
.header .menu-icon .navicon:after {
top: -5px;
}
/* menu btn */
.header .menu-btn {
display: none;
}
.header .menu-btn:checked~.menu {
max-height: 340px;
background-color: black;
}
.header .menu-btn:checked~.menu-icon .navicon {
background: transparent;
}
.header .menu-btn:checked~.menu-icon .navicon:before {
transform: rotate(-45deg);
}
.header .menu-btn:checked~.menu-icon .navicon:after {
transform: rotate(45deg);
}
.header .menu-btn:checked~.menu-icon:not(.steps) .navicon:before,
.header .menu-btn:checked~.menu-icon:not(.steps) .navicon:after {
top: 0;
}
/* Responsive */
@media only screen and (max-width: 768px) {
.header li a {
padding: 15px;
border-bottom: 1px dotted #ddd;
color: white;
}
.header li a:hover {
padding: 15px;
border-bottom: 1px dotted #ddd;
color: blue;
}
}
@media only screen and (min-width: 768px) {
.menu-wrapper {
width: 100%;
}
.header li {
float: left;
}
.header .logo {
line-height: 1;
}
.header li a {
color: blue;
padding: 0px 30px;
border-right: 1px solid rgba(255, 255, 255, 0.2);
}
.header .menu {
clear: none;
float: right;
max-height: none;
}
.header .menu-icon {
display: none;
}
}
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<script src="script.js"></script>
<link href="style.css" rel="stylesheet">
<meta charset="utf-8">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" rel="stylesheet">
<meta name="viewport" content="initial-scale=1, width=device-width shrink-to-fit=no">
<title>Hello! </title>
</head>
<body>
<div class="empty"></div>
<div class="all">
<div class="menu-wrapper">
<header class="header">
<a href="#home">Logo</a>
<input class="menu-btn" type="checkbox" id="menu-btn" />
<label class="menu-icon" for="menu-btn"><span class="navicon"></span></label>
<ul class="menu">
<li><a href="#">Home</a></li>
<li><a href="about.html">About Us</a></li>
<li><a href="#">More</a></li>
<li><a href="#">More2</a></li>
</ul>
</header>
</div>
</div>
<div class="row">
<div class="container-fluid" id="about">
<h5>Text</h5>
<div class="col-lg-12">
<article>
<p class="about-par">
Pellentesque in ipsum id orci porta dapibus. Cras ultricies ligula sed magna dictum porta. Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Proin eget tortor risus. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Vivamus suscipit tortor eget felis porttitor volutpat. Proin eget tortor risus. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
<br>Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec velit neque, auctor sit amet aliquam vel, ullamcorper sit amet ligula. Pellentesque in ipsum id orci porta dapibus. Vivamus suscipit tortor eget felis porttitor volutpat. Proin eget tortor risus. Vivamus suscipit tortor eget felis porttitor volutpat.
<br>
Donec sollicitudin molestie malesuada. Nulla quis lorem ut libero malesuada feugiat. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur aliquet quam id dui posuere blandit. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus.
<br>Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Donec sollicitudin molestie malesuada. Vivamus suscipit tortor eget felis porttitor volutpat. Vivamus suscipit tortor eget felis porttitor volutpat. Curabitur aliquet quam id dui posuere blandit. Nulla porttitor accumsan tincidunt. Nulla quis lorem ut libero malesuada feugiat. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec velit neque, auctor sit amet aliquam vel, ullamcorper sit amet ligula. Donec sollicitudin molestie malesuada.
<br>
Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Cras ultricies ligula sed magna dictum porta. Proin eget tortor risus. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Donec sollicitudin molestie malesuada. Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Cras ultricies ligula sed magna dictum porta.
<br>Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec velit neque, auctor sit amet aliquam vel, ullamcorper sit amet ligula. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Quisque velit nisi, pretium ut lacinia in, elementum id enim.
<br>
Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Nulla porttitor accumsan tincidunt. Curabitur aliquet quam id dui posuere blandit. Cras ultricies ligula sed magna dictum porta. Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Curabitur non nulla sit amet nisl tempus convallis quis ac lectus. Cras ultricies ligula sed magna dictum porta. Proin eget tortor risus. Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec velit neque, auctor sit amet aliquam vel, ullamcorper sit amet ligula. Nulla porttitor accumsan tincidunt. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Curabitur non nulla sit amet nisl tempus convallis quis ac lectus.
<br>
Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Vivamus suscipit tortor eget felis porttitor volutpat. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Donec sollicitudin molestie malesuada. Cras ultricies ligula sed magna dictum porta. Vivamus suscipit tortor eget felis porttitor volutpat. Donec rutrum congue leo eget malesuada.
<br>Sed porttitor lectus nibh. Curabitur aliquet quam id dui posuere blandit. Pellentesque in ipsum id orci porta dapibus. Proin eget tortor risus. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Nulla quis lorem ut libero malesuada feugiat. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
<br>
Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Vivamus suscipit tortor eget felis porttitor volutpat. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Donec sollicitudin molestie malesuada. Cras ultricies ligula sed magna dictum porta. Vivamus suscipit tortor eget felis porttitor volutpat. Donec rutrum congue leo eget malesuada.
<br>Sed porttitor lectus nibh. Curabitur aliquet quam id dui posuere blandit. Pellentesque in ipsum id orci porta dapibus. Proin eget tortor risus. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Nulla quis lorem ut libero malesuada feugiat. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
<br>
Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Vivamus suscipit tortor eget felis porttitor volutpat. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Donec sollicitudin molestie malesuada. Cras ultricies ligula sed magna dictum porta. Vivamus suscipit tortor eget felis porttitor volutpat. Donec rutrum congue leo eget malesuada.
<br>Sed porttitor lectus nibh. Curabitur aliquet quam id dui posuere blandit. Pellentesque in ipsum id orci porta dapibus. Proin eget tortor risus. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Nulla quis lorem ut libero malesuada feugiat. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
</p>
</article>
</div>
</div>
</div>
</body>
</html>
JSFIDDLE
https://jsfiddle.net/janie2000/pf3L4y1d/5/
非常感谢。
因为您使用的是 bootstrap，我 link 您应该可以使用我的 jsfiddle。
不需要 css 或 js，bootstrap 会为您完成工作
JSFIDDLE: https://jsfiddle.net/9yeb023u/1/
我创建了一个基本的导航栏，但您可以对其进行自定义，如果您有任何问题，请参阅 bootstrap 的文档 link：
https://getbootstrap.com/docs/4.5/getting-started/introduction/
您希望页眉始终位于顶部，但不覆盖您的内容，对吗？
如果我没看错，那么您需要做的是更改您的主要内容包装器，即#about 元素，您只需要让这个元素可滚动，而不是整个页面。
为此我提出这个 css:
#about {
max-width: 100%;
position:relative;
top:100px;
border: 5px solid purple;
padding: 20px;
text-align: center;
justify-content: center;
height:100px;
overflow:scroll;
}
所以这里我们把位置改成相对的，所以我们可以将内容向下移动导航的高度（top:100px）
然后我们限制这个组件的高度 (height:100px) 并使其可滚动 (overflow:scrool) - 这样你就可以滚动，当你这样做时 - 你在内容上滚动，而不是整个页面，所以导航栏具有固定位置保持领先
这里是 fiddle - https://jsfiddle.net/t2a4938f/12/
我设置的是大概值，你可以玩玩看效果更好
更新
如果你想让内容占据屏幕的整个高度（不限于上面的一些严格高度 - 100px），你可以使用 height:100vh
header 是粘性的，body 内容总是在 header 下方。
h.header {
width: 100%;
top: 0;
position: sticky;
background-color: black;
}
#about {
max-width: 100%;
border: 5px solid purple;
padding: 20px;
text-align: center;
justify-content: center;
}
我已经尝试了一些建议，例如从 body 中删除溢出，将 z-index 添加到 header 和 padding-top，但似乎没有任何效果。
一开始它运行良好，但后来我实现了很多 Lorem Ipsum 文本。所有内容都只是在导航栏上下滑动。附上JS fiddle 说明一下
我尝试了整个 body 溢出并尝试了 fixed/relative header 位置。没有任何效果。
非常感谢任何意见。
我希望得到一些帮助，让我知道如何让导航条在向下滚动时不能真正保持固定。
当然还有如何让内容不水平溢出
请帮忙！
CSS
html,
body {
position: absolute;
width: 100%;
top: 0;
min-height: 100vh;
font-family: sans-serif;
margin: 0 !important;
padding: 0 !important;
}
ul {
box-sizing: border-box;
}
#logo {
max-width: 15%;
}
.menu-wrapper {
background-color: white;
}
.header {
z-index: 1000;
width: 100%;
margin: 1.2em;
position: fixed;
background-color: black;
}
#about {
position: absolute;
max-width: 100%;
top: 49%;
left: 50%;
transform: translate(-50%, -50%);
border: 5px solid purple;
padding: 20px;
text-align: center;
justify-content: center;
}
.about-par {
font-size: 1em;
}
.header ul {
padding: 0;
list-style: none;
overflow: hidden;
margin-right: 2em;
}
.header li a {
display: block;
color: blue;
text-decoration: none;
font-size: 1em;
}
.header li a:hover,
.header .menu-btn:hover {
color: black;
}
.header li a:active,
.header .menu-btn: active,
{
color: blue;
}
.header li a:active {
color: blue;
}
.header .logo {
color: black;
display: block;
float: left;
font-size: 1.1em;
padding: 12px;
margin-left: 1em;
text-decoration: none;
}
.header .menu {
clear: both;
max-height: 0;
transition: max-height 0.2s ease-out;
}
/* menu icon */
.header .menu-icon {
cursor: pointer;
display: inline-block;
float: right;
padding: 28px 40px;
position: relative;
user-select: none;
}
.header .menu-icon .navicon {
display: block;
height: 2px;
position: relative;
transition: background 0.2s ease-out;
width: 18px;
}
.header .menu-icon .navicon:before,
.header .menu-icon .navicon:after {
background: black;
content: "";
display: block;
height: 100%;
position: absolute;
transition: all 0.2s ease-out;
width: 100%;
}
.header .menu-icon .navicon:before {
top: 5px;
}
.header .menu-icon: before {
background: transparent;
}
.header .menu-icon .navicon:after {
top: -5px;
}
/* menu btn */
.header .menu-btn {
display: none;
}
.header .menu-btn:checked~.menu {
max-height: 340px;
background-color: black;
}
.header .menu-btn:checked~.menu-icon .navicon {
background: transparent;
}
.header .menu-btn:checked~.menu-icon .navicon:before {
transform: rotate(-45deg);
}
.header .menu-btn:checked~.menu-icon .navicon:after {
transform: rotate(45deg);
}
.header .menu-btn:checked~.menu-icon:not(.steps) .navicon:before,
.header .menu-btn:checked~.menu-icon:not(.steps) .navicon:after {
top: 0;
}
/* Responsive */
@media only screen and (max-width: 768px) {
.header li a {
padding: 15px;
border-bottom: 1px dotted #ddd;
color: white;
}
.header li a:hover {
padding: 15px;
border-bottom: 1px dotted #ddd;
color: blue;
}
}
@media only screen and (min-width: 768px) {
.menu-wrapper {
width: 100%;
}
.header li {
float: left;
}
.header .logo {
line-height: 1;
}
.header li a {
color: blue;
padding: 0px 30px;
border-right: 1px solid rgba(255, 255, 255, 0.2);
}
.header .menu {
clear: none;
float: right;
max-height: none;
}
.header .menu-icon {
display: none;
}
}
HTML
<!DOCTYPE html>
<html lang="en">
<head>
<script src="script.js"></script>
<link href="style.css" rel="stylesheet">
<meta charset="utf-8">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@4.5.3/dist/css/bootstrap.min.css" rel="stylesheet">
<meta name="viewport" content="initial-scale=1, width=device-width shrink-to-fit=no">
<title>Hello! </title>
</head>
<body>
<div class="empty"></div>
<div class="all">
<div class="menu-wrapper">
<header class="header">
<a href="#home">Logo</a>
<input class="menu-btn" type="checkbox" id="menu-btn" />
<label class="menu-icon" for="menu-btn"><span class="navicon"></span></label>
<ul class="menu">
<li><a href="#">Home</a></li>
<li><a href="about.html">About Us</a></li>
<li><a href="#">More</a></li>
<li><a href="#">More2</a></li>
</ul>
</header>
</div>
</div>
<div class="row">
<div class="container-fluid" id="about">
<h5>Text</h5>
<div class="col-lg-12">
<article>
<p class="about-par">
Pellentesque in ipsum id orci porta dapibus. Cras ultricies ligula sed magna dictum porta. Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Proin eget tortor risus. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Vivamus suscipit tortor eget felis porttitor volutpat. Proin eget tortor risus. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
<br>Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec velit neque, auctor sit amet aliquam vel, ullamcorper sit amet ligula. Pellentesque in ipsum id orci porta dapibus. Vivamus suscipit tortor eget felis porttitor volutpat. Proin eget tortor risus. Vivamus suscipit tortor eget felis porttitor volutpat.
<br>
Donec sollicitudin molestie malesuada. Nulla quis lorem ut libero malesuada feugiat. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur aliquet quam id dui posuere blandit. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus.
<br>Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Donec sollicitudin molestie malesuada. Vivamus suscipit tortor eget felis porttitor volutpat. Vivamus suscipit tortor eget felis porttitor volutpat. Curabitur aliquet quam id dui posuere blandit. Nulla porttitor accumsan tincidunt. Nulla quis lorem ut libero malesuada feugiat. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec velit neque, auctor sit amet aliquam vel, ullamcorper sit amet ligula. Donec sollicitudin molestie malesuada.
<br>
Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Cras ultricies ligula sed magna dictum porta. Proin eget tortor risus. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Donec sollicitudin molestie malesuada. Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Cras ultricies ligula sed magna dictum porta.
<br>Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec velit neque, auctor sit amet aliquam vel, ullamcorper sit amet ligula. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Quisque velit nisi, pretium ut lacinia in, elementum id enim.
<br>
Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Nulla porttitor accumsan tincidunt. Curabitur aliquet quam id dui posuere blandit. Cras ultricies ligula sed magna dictum porta. Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Curabitur non nulla sit amet nisl tempus convallis quis ac lectus. Cras ultricies ligula sed magna dictum porta. Proin eget tortor risus. Praesent sapien massa, convallis a pellentesque nec, egestas non nisi. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Donec velit neque, auctor sit amet aliquam vel, ullamcorper sit amet ligula. Nulla porttitor accumsan tincidunt. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Vestibulum ac diam sit amet quam vehicula elementum sed sit amet dui. Curabitur arcu erat, accumsan id imperdiet et, porttitor at sem. Curabitur non nulla sit amet nisl tempus convallis quis ac lectus.
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Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Vivamus suscipit tortor eget felis porttitor volutpat. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Donec sollicitudin molestie malesuada. Cras ultricies ligula sed magna dictum porta. Vivamus suscipit tortor eget felis porttitor volutpat. Donec rutrum congue leo eget malesuada.
<br>Sed porttitor lectus nibh. Curabitur aliquet quam id dui posuere blandit. Pellentesque in ipsum id orci porta dapibus. Proin eget tortor risus. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Nulla quis lorem ut libero malesuada feugiat. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
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Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Vivamus suscipit tortor eget felis porttitor volutpat. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Donec sollicitudin molestie malesuada. Cras ultricies ligula sed magna dictum porta. Vivamus suscipit tortor eget felis porttitor volutpat. Donec rutrum congue leo eget malesuada.
<br>Sed porttitor lectus nibh. Curabitur aliquet quam id dui posuere blandit. Pellentesque in ipsum id orci porta dapibus. Proin eget tortor risus. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Nulla quis lorem ut libero malesuada feugiat. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
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Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Vivamus suscipit tortor eget felis porttitor volutpat. Quisque velit nisi, pretium ut lacinia in, elementum id enim. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Donec sollicitudin molestie malesuada. Cras ultricies ligula sed magna dictum porta. Vivamus suscipit tortor eget felis porttitor volutpat. Donec rutrum congue leo eget malesuada.
<br>Sed porttitor lectus nibh. Curabitur aliquet quam id dui posuere blandit. Pellentesque in ipsum id orci porta dapibus. Proin eget tortor risus. Vivamus magna justo, lacinia eget consectetur sed, convallis at tellus. Mauris blandit aliquet elit, eget tincidunt nibh pulvinar a. Nulla quis lorem ut libero malesuada feugiat. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
</p>
</article>
</div>
</div>
</div>
</body>
</html>
JSFIDDLE https://jsfiddle.net/janie2000/pf3L4y1d/5/
非常感谢。
因为您使用的是 bootstrap，我 link 您应该可以使用我的 jsfiddle。 不需要 css 或 js，bootstrap 会为您完成工作
JSFIDDLE: https://jsfiddle.net/9yeb023u/1/
我创建了一个基本的导航栏，但您可以对其进行自定义，如果您有任何问题，请参阅 bootstrap 的文档 link： https://getbootstrap.com/docs/4.5/getting-started/introduction/
您希望页眉始终位于顶部，但不覆盖您的内容，对吗？ 如果我没看错，那么您需要做的是更改您的主要内容包装器，即#about 元素，您只需要让这个元素可滚动，而不是整个页面。
为此我提出这个 css:
#about {
max-width: 100%;
position:relative;
top:100px;
border: 5px solid purple;
padding: 20px;
text-align: center;
justify-content: center;
height:100px;
overflow:scroll;
}
所以这里我们把位置改成相对的，所以我们可以将内容向下移动导航的高度（top:100px） 然后我们限制这个组件的高度 (height:100px) 并使其可滚动 (overflow:scrool) - 这样你就可以滚动，当你这样做时 - 你在内容上滚动，而不是整个页面，所以导航栏具有固定位置保持领先
这里是 fiddle - https://jsfiddle.net/t2a4938f/12/
我设置的是大概值，你可以玩玩看效果更好
更新
如果你想让内容占据屏幕的整个高度（不限于上面的一些严格高度 - 100px），你可以使用 height:100vh
header 是粘性的，body 内容总是在 header 下方。
h.header {
width: 100%;
top: 0;
position: sticky;
background-color: black;
}
#about {
max-width: 100%;
border: 5px solid purple;
padding: 20px;
text-align: center;
justify-content: center;
}