Generate a Contact Us Responsive Form

<form id="contact-form" class="form" action="" method="post">
    <h3 class="text-center">Contact Us</h3>
    <h4 class="text-center">Contact us today, and get reply with in 24 hours!</h4>
    <div class="form-group">
        <label for="name">Name</label>
        <input type="text" class="form-control" id="name" name="name"  placeholder="Name">
    </div>
    <div class="form-group">
        <label for="exampleInputEmail1">Email address</label>
        <input type="email" class="form-control" id="email" name="email" placeholder="Enter email">
    </div>
    <div class="form-group ">
        <label for="message">Message</label>
        <textarea class="form-control" placeholder="Please write your message here" id="message" name="message" rows="5"></textarea>
    </div>
    <button type="submit" class="btn