bootstap.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Bootstap</title>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
<style>
    .flex {
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
    }

</style>
</head>
<body>
    <div class="flex">
    <div class="card" style="width: 18rem;">
  <img src="https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQEc9A_S6BPxCDRp5WjMFEfXrpCu1ya2OO-Lw&s" class="card-img-top" alt="...">
  <div class="card-body">
    <h5 class="card-title">Card title</h5>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    <a href="chess_box.html" class="btn btn-primary">wanna play chess?</a>
  </div>
</div>
</div>
</body>
</html>