Edit in JSFiddle

<div class="well">
  <form action="/person.php" method="post">
    <div class="form-group">
      <label for="firstname">First Name</label>
      <input class="form-control" type="text" name="firstname" placeholder="Enter your first name">
    </div>
    <div class="form-group">
      <label for="lastname">Last Name</label>
      <input class="form-control" type="text" name="lastname" placeholder="Enter your last name">
    </div>
    <div class="form-group">
      <label>Gender</label>
      <label class="checkbox-inline">
        <input type="radio" name="gender" id="male" value="male">
        Male
      </label>
      <label class="checkbox-inline">
        <input type="radio" name="gender" id="female" value="female">
        Female
      </label>
    </div>
    <input type="submit" class="btn btn-primary" value="Submit">
  </form>
</div>