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CSS Bootstrap 4 Basics (Retired) Building Forms with Bootstrap Custom Form Controls for Cross-Browser Consistency

Why does my expiration date push up against the side of the form?

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <meta http-equiv="x-ua-compatible" content="ie=edge">
    <title>Full Stack Conf</title>
    <!-- bootstrap css -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.3/css/bootstrap.min.css" integrity="sha384-MIwDKRSSImVFAZCVLtU0LMDdON6KVCrZHyVQQj6e8wIEJkW4tvwqXrbMIya1vriY" crossorigin="anonymous">
  </head>

  <body id="home" data-spy="scroll" data-target=".navbar" data-offset="100">
    <!--navbar-->
  <nav class="navbar navbar-dark bg-primary navbar-fixed-top">
    <div class="container">
      <ul class="nav navbar-nav">
        <li class="nav-item">
          <a class="nav-link" href="#home">Home <span class="sr-only">current)</span></a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#about">About</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#speakers">Speakers</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="#schedule">Schedule</a>
        </li>
      </ul>
      <a class="navbar-brand pull-sm-right m-r-0 hidden-xs-down" href="http://www.teamtreehouse.com">Presented by DW</a>
    </div>
  </nav>
    <!--/navbar-->

    <!--Jumbotron-->
    <div class="jumbotron jumbotron-fluid bg-info">
      <div class="container text-sm-center p-t-3">
        <h1 class="display-2">Full Stack Conf</h1>
        <p class="lead">A One-day Conference About All Things JavaScript</p>

        <div class="btn-group m-t-2" role="group" aria-label="Basic example">
          <button type="button" class="btn btn-primary btn-lg" data-toggle="modal" data-target="#register">Register Now</button>
          <a class="btn btn-secondary btn-lg" href="#speakers">See Speakers</a>
        </div>
      </div>
    </div>
    <!--/Jumbotron-->


    <div class="container p-t-2">
      <!--about-->
      <div id="about" class="row">
        <div class="col-lg-4 push-lg-4">
          <h3 class="m-b-2">About Full Stack Conf</h3>
          <img class="m-b-1 img-fluid img-rounded hidden-xs-down" src="img/pdx.jpg" alt="Portland">
          <p>The beautiful city of Portland, Oregon will be the host city for Full Stack Conf!</p>
          <p>Explore the future of JavaScript with a lineup of industry professionals. Discover new techniques           to advance your career as a web developer.</p>
        </div>
      <div class="col-lg-4 pull-lg-4">
        <h3 class="m-b-2">Expert Speakers</h3>
        <p>Our expert speaker lineup was just announced, so don't wait too long before grabbing your tickets!           </p>
        <p>Want to meet the international JavaScript community and share skills with some of the world's top           experts, hackers, and makers? Be the first to know what to expect for the future of JavaScript.</p>
        <p>Full Stack Conf is committed to being inclusive and welcoming for everyone. We look forward to               another intensive day of learning and sharing.</p>
      </div>
        <div class="col-lg-4">
          <h3 class="m-b-2">What You'll Learn</h3>
          <div class="list-group">

            <a href="#" class="list-group-item"><strong>MongoDB</strong>: NoSQL database</a>
            <a href="#" class="list-group-item"><strong>Angular</strong>: JavaScript framework </a>
            <a href="#" class="list-group-item"><strong>Express</strong>: Framework for Node</a>
            <a href="#" class="list-group-item"><strong>Node.js</strong>: JavaScript environment</a>
            <a href="#" class="list-group-item"><strong>ES2015</strong>: Latest version of JavaScript</a>
            <a href="#" class="list-group-item"><strong>Babel</strong>: JavaScript compiler</a>
          </div>
        </div>
      </div> <!--about-->

      <!--Speakers-->
      <h1 id="speakers" class="display-4 text-xs-center m-  y-3 text-muted">Speakers</h1>
      <div class="row">
        <div class="col-md-6 col-lg-4">
          <div class="card">
            <img class="card-img-top img-fluid" src="img/angie.png" alt="Card image cap">
            <div class="card-block">
              <h4 class="card-title">Angie McAngular</h4>
              <p class="card-text">Angie is a web developer and teacher who is passionate about building scalable, data driven web app, especially ones that address old problems with new tech.</p>
            </div>
          </div>
        </div>

        <div class="col-md-6 col-lg-4">
          <div class="card">
            <img class="card-img-top img-fluid" src="img/nodestradamus.png" alt="Card image cap">
            <div class="card-block">
              <h4 class="card-title">NodeStradamus</h4>
              <p class="card-text">"NodeStra" is a software engineer and philosopher trying to leave the world better than he found it. He codes for non-profits, eCommerce, and large-scale web apps.</p>
            </div>
          </div>
        </div>

      <div class="col-md-6 col-lg-4">
        <div class="card">
            <img class="card-img-top img-fluid" src="img/geo.png" alt="Card image cap">
            <div class="card-block">
              <h4 class="card-title">Geo "Lo" Cation</h4>
              <p class="card-text">Geo is a JavaScript developer working on large-scale applications. He's also a teacher who strives to support students in removing all barriers to learning code.</p>
            </div>
          </div>
         </div>


      <div class="col-md-6 col-lg-4">
        <div class="card">
            <img class="card-img-top img-fluid" src="img/ecma.png" alt="Card image cap">
            <div class="card-block">
              <h4 class="card-title">Ecma Scriptnstuff</h4>
              <p class="card-text">Ecma found her passion for computers and programming over 15 years ago. She is excited to introduce people to the wonderful world of JavaScript.</p>
            </div>
          </div>
         </div>


      <div class="col-md-6 col-lg-4">
        <div class="card">
            <img class="card-img-top img-fluid" src="img/jay.png" alt="Card image cap">
            <div class="card-block">
              <h4 class="card-title">Jay Query</h4>
              <p class="card-text">Jay is a developer, author of CSS: The Missing Manual, JavaScript &amp; jQuery: The Missing Manual, and web development teacher.</p>
            </div>
          </div>
         </div>

      <div class="col-md-6 col-lg-4">
       <div class="card">
            <img class="card-img-top img-fluid" src="img/json.png" alt="Card image cap">
            <div class="card-block">
              <h4 class="card-title">Json Babel</h4>
              <p class="card-text">All of his professional life, Json has worked with computers online; he is a polyglot programmer and likes using the right tools for the job.</p>
            </div>
          </div>
         </div>



      </div>
      <!-- /speakers -->


      <!--Schedule-->
      <h1 id="schedule" class="display-4 text-xs-center m-y-3 text-muted">Schedule</h1>
      <ul class="list-group">
        <li class="list-group-item">
          <h4 class="list-group-item-heading">Keynote: Internet of Things <span class="tag tag-info tag-pill pull-xs-right">9.00am</span></h4>

          NodeStradamus
        </li>
        <li class="list-group-item">
          <h4 class="list-group-item-heading">Angular Basics<span class="tag  tag-info tag-pill pull-xs-right">10.00am</span></h4>
          Angie McAngular
        </li>
        <li class="list-group-item">
          <h4 class="list-group-item-heading">Hey, Mongo!<span class="tag  tag-info tag-pill pull-xs-right">11.00am</span>             </h4>
          Jay Query
        </li>
        <li class="list-group-item list-group-item-success">
          <h4 class="list-group-item-heading">Lunchbreak<span class="tag  tag-info tag-pill pull-xs-right">12.00pm</span>             </h4>
          Free Pizza for everyone!s
        </li>
      </ul>
      <!--/Schedule-->
      <!--callout button-->

      <button type="button" class="btn btn-outline-info btn-lg d-block m-x-auto m-y-3" data-toggle="modal" data-target="#register">Don't Miss Out, Register Now</button>

      <!-- signup form -->
      <hr>
      <div class="row p-y-2 text-muted">
        <div class="col-md-6 col-xl-5">
          <p><strong>About DW</strong></p>
          <p>DW is a web designer.</p>
        </div>
        <div class="col-md-6 col-xl-5 offset-xl-2">
          <p><strong>Stay up-to-date on Full Stack Conf</strong></p>
          <div class="input-group">
            <input type="text" class="form-control" placeholder="Email">
            <span class="input-group-btn">
              <button class="btn btn-primary" type="button">Sign up</button>
            </span>
          </div>
        </div>
      </div>
      <hr><!-- /signup form -->

      <!--footer-->
      <div class="row p-y-1">
        <div class="col-md-7">
          <ul class="nav nav-inline">
            <li class="nav-item">
              <a class="nav-link active" href="#">Community</a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">Tracks</a>
            </li>
            <li class="nav-item">
              <!-- Example split danger button -->
              <div class="btn-group dropup">
                <button type="button" class="btn btn-secondary">Other Confs</button>
                <button type="button" class="btn btn-secondary dropdown-toggle   dropdown-toggle-split" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                  <span class="sr-only">Toggle Dropdown</span>
                </button>
                <div class="dropdown-menu">
                  <a class="dropdown-item" href="#">CSS Conf</a>
                  <a class="dropdown-item" href="#">Python Conf</a>
                  <a class="dropdown-item" href="#">Java Conf</a>               
                  <a class="dropdown-item" href="#">Swift Conf</a>
                </div>
              </div>
            </li>

          </ul>

        </div>
        <div class="col-md-5 text-md-right">
          <small>&copy; 2016 Full Stack Conf &amp; Treehouse</small>
        </div>
      </div>
      <!--footer-->

    </div> <!--container-->

    <!--=========================
    FORM MODAL
  ============================-->

    <div id="register" class="modal fade">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header bg-info">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
        <h4 class="modal-title">Register for Full Stack Conf</h4>
      </div>
      <div class="modal-body">

      <!-- registration form -->

        <div class="alert alert-warning alert-dismissible fade in" role="alert">
          <button type="button" class="close" data-dismiss="alert" aria-label="Close">
            <span aria-hidden="true">&times;</span>
          </button>
          <strong>Holy guacamole!</strong> Early bird registration ends in two days.
        </div>

        <form>
          <h5 class="m-b-2">Basic Info</h5>
          <div class="form-group">
            <label for="name">Name</label>
            <input type="text" class="form-control" id="name" placeholder="Dan Wu">
          </div>
          <div class="form-group">
            <label for="email">Email</label>
            <input type="email" class="form-control" id="email" placeholder="Another input">
          </div>
          <div class="form-group">
            <label for="role">Job Role:</label>
            <select class="form-control c-select" id="role" name="user_role">

              <option value="full stack js developer">Full Stack JavaScript Developer</option>
              <option value="front end developer">Front End Developer</option>
              <option value="back end developer">Back End Developer</option>
              <option value="designer">Designer</option>          
              <option value="student">Student</option> 
            </select>
          </div>

          <hr class="m-y-2">
          <h5 class="m-b-2">Which Topics Interest You Most?</h5>

            <div class="form-check">
            <label class="custom-control custom-checkbox">
              <input type="checkbox" class="custom-control-input">
              <span class="custom-control-indicator"></span>
              <span class="custom-control-description">JavaScript frameworks</span>
            </label>
            </div>
            <div class="form-check">
            <label class="custom-control custom-checkbox">
              <input type="checkbox" class="custom-control-input">
              <span class="custom-control-indicator"></span>
              <span class="custom-control-description">JavaScript libraries</span>
            </label>
            </div>
            <div class="form-check">
            <label class="custom-control custom-checkbox">
              <input type="checkbox" class="custom-control-input">
              <span class="custom-control-indicator"></span>
              <span class="custom-control-description">Node.js</span>
            </label>
            </div>
            <div class="form-check">
            <label class="custom-control custom-checkbox">
              <input type="checkbox" class="custom-control-input">
              <span class="custom-control-indicator"></span>
              <span class="custom-control-description">Build tools</span>
            </label>
            </div>
            <div class="form-check">
            <label class="custom-control custom-checkbox">
              <input type="checkbox" class="custom-control-input">
              <span class="custom-control-indicator"></span>
              <span class="custom-control-description">ES2015</span>
            </label>
            </div>

<!-- payment information -->
            <hr class="m-b-2">
            <h5 class="m-b-2">Payment info</h5>

              <div class="row">
                <div class="col-lg-6 form-group">
                  <label for="cc-num">Card Number:</label>
                  <input class="form-control" id="cc-num" type="text">
                </div>

                <div class="col-lg-3 form-group">
                  <label for="zip">Zip Code:</label>
                  <input class="form-control" id="zip" type="text">
                </div>

                <div class="col-lg-3 form-group">
                  <label for="cvv">CVV:</label>
                  <input class="form-control" id="cvv" type="text">
                </div>

              <div class="row">
                <label class="col-lg-12">Expiration Date:</label>

                <div class="col-lg-8 form-group">                   
                  <select class="c-select form-control" id="exp-month">
                    <option value="1">1 - January</option>
                    <option value="2">2 - February</option>
                    <option value="3">3 - March</option>
                    <option value="4">4 - April</option>
                    <option value="5">5 - May</option>
                    <option value="6">6 - June</option>
                    <option value="7">7 - July</option>
                    <option value="8">8 - August</option>
                    <option value="9">9 - September</option>
                    <option value="10">10 - October</option>
                    <option value="11">11 - November</option> 
                    <option value="12">12 - December</option>                       
                  </select>                 
                </div>
                <div class="col-lg-4 form-group">
                  <select class="c-select form-control" id="exp-year">
                    <option value="2016">2016</option>
                    <option value="2017">2017</option>
                    <option value="2018">2018</option>
                    <option value="2019">2019</option>
                    <option value="2020">2020</option>                      
                  </select>               
                </div>                
              </div>

              </div> <!-- end payment info div -->
  <!-- end payment information -->

        <hr class="m-b-2">
        <button type="submit" class="btn btn-primary">Submit</button>


        </form>


      <!-- /registration form -->


      </div> <!-- /modal-body -->

    </div><!-- /.modal-content -->
  </div><!-- /.modal-dialog -->
</div><!-- /.modal -->




    <!-- jQuery first, then bootstrap js -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.0.0/jquery.min.js" integrity="sha384-THPy051/pYDQGanwU6poAc/hOdQxjnOEXzbT+OuUAFqNqFjL+4IGLBgCJC3ZOShY" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.2.0/js/tether.min.js" integrity="sha384-Plbmg8JY28KFelvJVai01l8WyZzrYWG825m+cZ0eDDS1f7d/js6ikvy1+X+guPIB" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.3/js/bootstrap.min.js" integrity="sha384-ux8v3A6CPtOTqOzMKiuo3d/DomGaaClxFYdCu2HPMBEkf6x2xiDyJ7gkXU0MWwaD" crossorigin="anonymous"></script>
  </body>
</html>