Bootstrap 5卡片内容无法正确居中，期望内容居中而非右对齐

你只需做两处调整，就能让卡片内所有内容完全居中：

• 给卡片的card-body添加text-center类，让标题、文本等内容居中对齐
• 给form-outline添加d-flex flex-column align-items-center类，确保表单标签和输入框也在水平方向居中

修改后的完整代码如下：

<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Bootstrap demo</title>
  <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-rbsA2VBKQhggwzxH7pPCaAqO46MgnOM80zW1RWuH61DGLwZJEdK2Kadq2F9CUG65" crossorigin="anonymous">
</head>

<body>
  <h1>Hello, world!</h1>

  <div class="container mt-5 p-5">
    <div class="row g-4">
      <div class="col-12 col-md-6 col-lg-3">
        <div class="card align-items-center bg-light">
          <img src="img/oranvour.png" alt="dfg juice" class="card-img-top">
          <div class="card-body text-center">
            <h5 class="card-title">Juice</h5>
            <p class="card-text">Price: $199.00</p>

            <div class="form-outline d-flex flex-column align-items-center">
              <label class="form-label" for="typeNumber">amount</label>
              <input type="number" id="typeNumber" class="form-control" style="max-width: 120px;" />
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-kenU1KFdBIe4zVF0s0G1M5b4hcpxyD9F7jL+jjXkk+Q2h455rYXK/7HAuoJl+0I4" crossorigin="anonymous"></script>
</body>

</html>

补充说明： #

• text-center是Bootstrap内置类，直接控制文本、内联元素的水平居中
• d-flex flex-column align-items-center将表单区域转为垂直flex布局，强制标签和输入框在水平方向居中
• 输入框的max-width: 120px是为了避免输入框过宽，可根据实际需求调整数值或直接移除

内容的提问来源于stack exchange，提问作者John Johnson