<!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://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.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="https://www.w3schools.com/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>