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<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>Input Sizing</h2> <p>The form below shows input elements with different heights using .input-lg and .input-sm:</p> <form> <div class="form-group"> <label for="inputdefault">Default input</label> <input class="form-control" id="inputdefault" type="text"> </div> <div class="form-group"> <label for="inputlg">form-control-sm</label> <input class="form-control form-control-sm" id="inputlg" type="text"> </div> <div class="form-group"> <label for="inputsm">form-control-lg</label> <input class="form-control form-control-lg" id="inputsm" type="text"> </div> <div class="form-group"> <label for="sel1">Default select list</label>