bootstrap 5 中无法将项目对齐到页面中心

Question

我正在尝试使用 bootstrap 弹性框将项目与 html 中的页面中心对齐。由于某种原因，align-items-centre 属性不起作用。

<!DOCTYPE html>

<head>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
</head>

<body>
    <div class="container d-flex justify-content-center align-items-center">
        elment goes here
    </div>
  
    <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.2/dist/umd/popper.min.js" integrity="sha384-IQsoLXl5PILFhosVNubq5LC7Qb9DXgDA9i+tQ8Zj3iwWAwPtgFTxbJ8NT4GN1R8p" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.min.js" integrity="sha384-cVKIPhGWiC2Al4u+LWgxfKTRIcfu0JTxR+EQDz/bgldoEyl4H0zUF0QKbrJ0EcQF" crossorigin="anonymous"></script>
</body>

Answer 1

你想达到什么目的？整个页面中只有一个元素？给你:D

position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);

Answer 2

您需要指定容器的高度，如果没有高度，垂直对齐将不起作用。您需要为元素添加 vh-100。

<!DOCTYPE html>

<head>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
    <link rel="stylesheet" href="style.css">
</head>

<body>
    <div class="container vh-100 d-flex justify-content-center align-items-center">
        elment goes here
    </div>
    <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.2/dist/umd/popper.min.js" integrity="sha384-IQsoLXl5PILFhosVNubq5LC7Qb9DXgDA9i+tQ8Zj3iwWAwPtgFTxbJ8NT4GN1R8p" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.min.js" integrity="sha384-cVKIPhGWiC2Al4u+LWgxfKTRIcfu0JTxR+EQDz/bgldoEyl4H0zUF0QKbrJ0EcQF" crossorigin="anonymous"></script>
</body>

bootstrap 5 中无法将项目对齐到页面中心

Cannot align items to centre of page in bootstrap 5

html

alignment

bootstrap-5