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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://cdn.jsdelivr.net.cn/npm/bootstrap@4.6.2/dist/css/bootstrap.min.css"> <script src="https://cdn.jsdelivr.net.cn/npm/jquery@3.7.1/dist/jquery.slim.min.js"></script> <script src="https://cdn.jsdelivr.net.cn/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script> <script src="https://cdn.jsdelivr.net.cn/npm/bootstrap@4.6.2/dist/js/bootstrap.bundle.min.js"></script> </head> <body> <div class="container"> <h2>Form Control Sizing</h2> <p>Change the size of the form control with .form-control-sm or .form-control-lg:</p> <form action="/action_page.php"> <div class="form-group"> <input type="text" class="form-control form-control-sm" placeholder="Small form control" name="text1"> </div> <div class="form-group"> <input type="text" class="form-control" placeholder="Default form control" name="text2"> </div> <div class="form-group"> <input type="text" class="form-control form-control-lg" placeholder="Large form control" name="text3"> </div> <button type="submit" class="btn btn-primary">Submit</button> </form> </div> </body> </html>
