固定的底部
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
body, html {
width: 100%;
height: 100%;
padding: 0;
margin: 0;
}
.Site {
display: flex;
min-height: 100vh;
flex-direction: column;
}
.Site-content {
flex: 1;
}
header {
flex: none;
width: 100%;
height: 40px;
background: red;
}
footer {
flex: none;
height: 40px;
width: 100%;
background: red;
}
</style>
</head>
<body class="Site">
<header>...</header>
<main class="Site-content">
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
<p>1</p>
</main>
<footer>...</footer>
</body>
</html>