<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div class="row"> <div class="col-md-8 col-md-offset-2"> <form role="form" method="POST" action="#"> <legend class="text-center">Register</legend> <fieldset> <legend>Account Details</legend> <div class="form-group col-md-6"> <label for="first_name">First name</label> <input type="text" class="form-control" name="" id="first_name" placeholder="First Name"> </div> <div class="form-group col-md-6"> <label for="last_name">Last name</label> <input type="text" class="form-control" name="last_name" id="" placeholder="Last Name"> </div> <div class="form-group col-md-12"> <label for="">Email</label> <input type="email" class="form-control" name="" id="" placeholder="Email"> </div> <div class="form-group col-md-6"> <label for="password">Password</label> <input type="password" class="form-control" name="" id="password" placeholder="Password"> </div> <div class="form-group col-md-6"> <label for="confirm_password">Confirm Password</label> <input type="password" class="form-control" name="" id="confirm_password" placeholder="Confirm Password"> </div> </fieldset> <fieldset> <legend>Optional Details</legend> <div class="form-group col-md-6"> <label for="country">Country of Residence</label> <select class="form-control" name="" id="country"> <option>Country 1</option> <option>Country 2</option> <option>Country 3</option> </select> </div> <div class="form-group col-md-12"> <label for="found_site">How did you find out about the site?</label> <select class="form-control" name="" id="found_site"> <option>Company</option> <option>Friend</option> <option>Colleague</option> <option>Advertisement</option> <option>Google Search</option> <option>Online Article</option> <option value="other" >Other</option> </select> </div> <div class="form-group col-md-12 hidden"> <label for="specify">Please Specify</label> <textarea class="form-control" id="specify" name=""></textarea> </div> </fieldset> <div class="form-group"> <div class="col-md-12"> <div class="checkbox"> <label> <input type="checkbox" value="" id=""> I accept the <a href="#">terms and conditions</a>. </label> </div> </div> </div> <div class="form-group"> <div class="col-md-12"> <button type="submit" class="btn btn-primary"> Register </button> <a href="#">Already have an account?</a> </div> </div> </form> </div> </div> </div>

form * { border-radius:0 !important; } form > fieldset > legend { font-size:120%; }

$(document).ready(function() { $('#found_site').on('change', function() { $(this).val() == "other" ? $('#specify').closest('.form-group').show() : $('#specify').closest('.form-group').hide(); }) })