<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>
<a href="#" data-toggle="modal" data-target="#login-modal">Login</a>
<div class="modal fade" id="login-modal" tabindex="-1" role="dialog" data-backdrop="static" aria-labelledby="myModalLabel" aria-hidden="true" style="display: none;">
<div class="modal-dialog">
<div class="loginmodal-container">
<form class="form-horizontal">
<fieldset>
<legend>Please enter your date of birth</legend>
<div class="form-group">
<div class="clearfix"></div>
<div class="col-md-4">
<input id="Day" name="Day" type="text" placeholder="Day" class="form-control input-md" required="">
<span class="help-block">Day</span>
</div>
<div class="col-md-4">
<input id="Month" name="Month" type="text" placeholder="Month" class="form-control input-md" required="">
<span class="help-block">Month</span>
</div>
<div class="col-md-4">