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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="/lib/bootstrap.min.css"> <script src="/lib/jquery-1.12.2.min.js"></script> <script src="/lib/bootstrap.min.js"></script> </head> <body> <div class="container"> <h2>Button Sizes</h2> <button type="button" class="btn btn-primary btn-lg">Large</button> <button type="button" class="btn btn-primary btn-md">Medium</button> <button type="button" class="btn btn-primary btn-sm">Small</button> <button type="button" class="btn btn-primary btn-xs">XSmall</button> </div> </body> </html>