JSFiddle - React, Tailwind, and code Playground

HTML

<html>
  <head><!--jQuery-->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<!--Moment JS-->
<script src="https://cdn.jsdelivr.net/momentjs/2.14.1/moment.min.js"></script>
<!--Bootstrap js-->
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

<!--bootstrap datetimepicker js-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datetimepicker/4.17.37/js/bootstrap-datetimepicker.min.js"></script>

<!--bootstrap datetimepicker css-->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datetimepicker/4.17.37/css/bootstrap-datetimepicker.min.css">

<!--bootstrap css-->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
  </head>
  <body>

<div class="container">
  <div class="card">
  
      <div class="card-body">
          <div class="card-title">Book an Appointment</div>
        <div class="card-text">
         <div class="row">
            <div class="col-md-12">
               <div class="form-group">
                  <label class="control-label">First Name</label>
                  <input type="text" class="form-control" name="firstname" id="firstname">
               </div>
            </div>
            <div class="col-md-12">
               <div class="form-group">
                  <label class="control-label">Last Name</label>
                  <input type="text" class="form-control" name="lastname" id="lastname">
               </div>
            </div>
         </div>
         <div class="row">
            <div class="col-md-12">
               <div class="form-group">
                  <label class="control-label">Email</label>
                  <input type="text" class="form-control" name="email" id="email">
               </div>
            </div>
            <div class='col-md-12'>
               <div class="form-group">
                  <label class="control-label">Appointment...