<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/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="appointment_sec">
<div class="container">
<div class="row">
<div class="col-md-6 col-lg-5 offset-lg-7 offset-md-6">
<div class="appoint_ment_form">
<h4>Book an Appointment</h4>
<p>It established fact that and reader will be distracted that it has a normal content.</p>
<form>
<input type="text" placeholder="Name of patients">
<input type="tel" placeholder="+88 017 ****">
<input id="datepicker-disable-past" type="text" placeholder="22 June, 2019">
<button type="submit" class="btn">Get Your Free Appointment</button>
</form>
</div>
<!--/.appoint_ment_form-->
</div>
</div>
</div>
<!--/.container-->
</div>
