我是HTML和CSS的新手，我正在尝试制作一个简单的页面。不幸的是，我很难将我的主要内容放在导航菜单下。也许我想在导航菜单下将其放置在100px左右。我尝试将职位更改为相对，绝对等。但是我几乎不知道自己在做什么。问题是，即使我给主位置一个不错的位置，当我填充大量内容时，它会自动进行（不扩展底部）并越过菜单并将其隐藏。我试图以某种方式"锁定" Main的顶部，以使其与导航始终处于相同的距离。如果我在主体中放了很多文本，我希望它扩大其底部而不改变其位置。
我的代码在这里：https：//www.w3schools.com/code/code/tryit.asp?filename = g1m05iyupr2h。
有人可以给我一个建议吗？非常感谢！
https://www.w3schools.com/code/code/tryit.asp?filename = G1M0W1037H57
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body, html {
margin: 0;
font-family: Arial, Helvetica, sans-serif;
background-color: black;
}
.bg-image {
background-image: url("http://www.stix.bg/wp-content/themes/stix-theme/images/stix1.jpg");
filter: blur(8px);
-webkit-filter: blur(8px);
background-position: center;
background-repeat: no-repeat;
background-size: cover;
background-attachment: fixed;
position: absolute;
margin-top: -300px; /*compensate for margin below*/
padding: 0;
height: 100%;
width: 100%;
}
.navigation {
background-color: rgba(0, 0, 0, 0.4);
position: absolute;
left: 50%;
top: 15%;
transform: translate(-50%, -50%);
width: 80%;
font-family: Arial;
border-radius: 10px;
justify-content: space-around;
display: flex;
border: 1px solid #f1f1f1;
}
main {
background-color: rgb(0, 0, 0);
background-color: rgba(0, 0, 0, 0.4);
color: white;
font-weight: bold;
border: 1px solid #f1f1f1;
border-radius: 10px;
position: relative;
left: 50%;
margin-top: 200px; /** <--set distance here**/
transform: translate(-50%);
width: 80%;
text-align: center;
}
ul li {
float: left;
text-decoration: none;
list-style: none;
}
a,
a:visited {
color: white;
text-decoration: none;
cursor: pointer;
}
a:hover, a:active {
color: white;
background-color: rgba(162, 44, 255, 0.5);
padding-top: 10px;
padding-bottom: 10px;
font-weight: bold;
box-shadow: inset 0 -4px 20px 2px rgba(162, 44, 255, 1);
}
.link {
padding: 10px;
border-radius: 10px 0 0 10px;
width: 100%;
text-align: center;
}
.link2 {
padding: 10px;
border-radius: 0 0 0 0;
width: 100%;
text-align: center;
}
.link3 {
padding: 10px;
border-radius: 0px 10px 10px 0px;
width: 100%;
text-align: center;
}
p {
text-align: center;
margin-left: 25px;
margin-right: 25px;
}
</style>
</head>
<body>
<div class="bg-image"></div>
<div class="navigation">
<ul>
<li><a class="link" href="#"> Menu 1 </a></li>
<li><a class="link2" href="#"> Menu 2 </a></li>
<li><a class="link2" href="#"> Menu 3 </a></li>
<li><a class="link2" href="#"> Menu 4 </a></li>
<li><a class="link3" href="#"> Menu 5 </a></li>
</ul>
</div>
<main>
<h1 style="font-size:30px">Text here</h1>
<p>
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has
survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</div>
</body>
</html>希望这会有所帮助。删除了.bg-image的position:relative，将position:absolute添加到MAIN中，并给出顶部以对齐。谢谢
body, html {
margin: 0;
height: 100%;
font-family: Arial, Helvetica, sans-serif;
background-color: black;
}
.bg-image {
background-image: url(http://www.stix.bg/wp-content/themes/stix-theme/images/stix1.jpg);
filter: blur(8px);
-webkit-filter: blur(8px);
background-position: center;
background-repeat: no-repeat;
background-size: cover;
height: 100%;
background-attachment: fixed;
}
.navigation {
background-color: rgba(0, 0, 0, 0.4);
position: absolute;
left: 50%;
top: 15%;
transform: translate(-50%,-50%);
width: 80%;
font-family:Arial;
border-radius: 10px;
justify-content: space-around;
display: flex;
border: 1px solid #f1f1f1;
}
main {
background-color: rgb(0,0,0);
background-color: rgba(0,0,0, 0.4);
color: white;
font-weight: bold;
border: 1px solid #f1f1f1;
border-radius: 10px;
position: absolute;
left: 50%;
transform: translate(-50%, -50%);
width: 80%;
text-align: center;
top: 310px;
}
a, a:visited{
color:white;
text-decoration: none;
cursor:pointer;
}
a:hover, a:active {
color: white;
background-color: rgba(162, 44, 255, 0.5);
padding-top: 10px;
padding-bottom: 10px;
font-weight: bold;
box-shadow: inset 0 -4px 20px 2px rgba(162, 44, 255, 1);
}
.link {
padding: 10px;
border-radius: 10px 0 0 10px;
width: 100%;
text-align: center;
}
.link2 {
padding: 10px;
border-radius: 0 0 0 0;
width: 100%;
text-align: center;
}
.link3 {
padding: 10px;
border-radius: 0px 10px 10px 0px;
width: 100%;
text-align: center;
}
p {
text-align: center;
margin-left: 25px;
margin-right: 25px;
}<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<div class="bg-image"></div>
<div class="navigation">
<a class="link" href="#"> Menu 1 </a>
<a class="link2" href="#"> Menu 2 </a>
<a class="link2" href="#"> Menu 3 </a>
<a class="link2" href="#"> Menu 4 </a>
<a class="link3" href="#"> Menu 5 </a>
</ul>
</div>
<main>
<h1 style="font-size:30px">Text here</h1>
<p>
Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</div>
</body>
</html>