我尝试了一些建议，比如删除正文中的溢出、在页眉中添加z索引和填充顶部，但似乎都不起作用。
起初它工作得很好，但后来我实现了很多Lorem Ipsum文本。所有内容都在导航栏上下滑动。我附上了一个JS小提琴来解释。
我尝试了整个身体溢出，并尝试了固定/相对的头部位置。什么都不管用。
如有任何意见，我们将不胜感激。
我很想知道如何让导航保持不变，但在向下滚动时不能真正保持固定。
当然，还有如何使内容不会水平溢出。
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.
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<br>
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<br>
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<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>
JSFIDDLEhttps://jsfiddle.net/janie2000/pf3L4y1d/5/
非常感谢。
您希望页眉始终位于顶部，但不覆盖您的内容，对吗？如果我说得对，那么你需要做的就是更改你的主要内容包装器，即#about元素，你只需要让这个元素可以滚动，而不是整个页面。
为此，我建议这个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;
}
因此，在这里我们将位置更改为相对位置，这样我们就可以将内容向下移动导航高度(顶部：100px(然后我们限制这个组件的高度(高度：100px(，并使其可滚动(溢出：scrool(-这样你就可以滚动，当你这样做时，你可以滚动内容，而不是整个页面，所以固定位置的导航条保持在的顶部
这是小提琴https://jsfiddle.net/t2a4938f/12/
我已经设置了近似值，你可以四处玩以更好地查看
更新
如果你想让内容占据屏幕的整个高度(不限于某些严格的高度，如-100px以上(，你可以使用高度：100vh
因为您正在使用引导程序，所以我将我的jsfiddle链接到您，它应该对您有效。不需要css或js，引导程序将为您完成工作
JSFIDDLE: https://jsfiddle.net/9yeb023u/1/
我创建了一个基本的导航栏，但你可以自定义它，如果你有任何问题，请访问这个链接上的bootstrap文档：https://getbootstrap.com/docs/4.5/getting-started/introduction/
标题是粘性的，正文内容总是在标题下面。
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;
}