JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
    <div class="container">
        <div class="row">
            <div class="span12" style="text-align:center; margin: 0 auto;">
                <form class="form-horizontal" style="width: 400px; margin: 0 auto;" method="post" action="/form/">
                    <fieldset>
                        <legend>Please login</legend>
                        <div class="control-group">
                            <label class="control-label" for="id_username">Username</label>
                            <div class="controls">
                                <input name="username" maxlength="100" placeholder="Enter your username..." type="text" class="input-large" id="id_username" />
                            </div>
                        </div>
                        <div class="control-group">
                            <label class="control-label" for="id_password">Password</label>
                            <div class="controls">
                                <input name="password" maxlength="100" placeholder="Enter your password..." type="password" class="input-large" id="id_password" />
                            </div>
                        </div>
                    </fieldset>
                </form>
            </div>
        </div>
    </div>