在最小的HTML程式碼中，Bootstrap的d-flex無法正常運作

我正在創建一個Bootstrap網站，但我已經遇到了一個問題，即使使用最簡單的HTML也無法解決這個問題（這個問題是網站上唯一的元素）...我感到絕望：

<!DOCTYPE html>
<html lang="fr">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Association Capucine - Gagner contre la leucémie</title>
</head>
<body>
  <div class="d-flex justify-content-around">
    <div class="p-2 bg-info">Flex item 1</div>
    <div class="p-2 bg-warning">Flex item 2</div>
    <div class="p-2 bg-primary">Flex item 3</div>
  </div>
  <main>
  </main>
  <footer>
  </footer>
</body>

</html>

提前感謝

P粉465675962401 天前547

<!DOCTYPE html> <html lang="fr"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Association Capucine - Gagner contre la leucémie</title> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-9ndCyUaIbzAi2FUVXJi0CjmCapSmO7SnpJef0486qhLnuZ2cdeRhO02iuK6FUUVM" crossorigin="anonymous"> </head> <body> <div class="d-flex justify-content-around"> <div class="p-2 bg-info">Flex item 1</div> <div class="p-2 bg-warning">Flex item 2</div> <div class="p-2 bg-primary">Flex item 3</div> </div> <main> </main> <footer> </footer> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js" integrity="sha384-geWF76RCwLtnZ8qwWowPQNguL3RmwHVBC9FhGdlKrxdiJJigb/j/68SIy3Te4Bkz" crossorigin="anonymous"></script> </body> </html>

在最小的HTML程式碼中，Bootstrap的d-flex無法正常運作

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