index.html

<form action="[api gateway url here]" method="POST" id="contact-us-form">
    <div class="form-group">
        <label for="nameInputEmail1">Name</label>
        <input type="text" class="form-control" id="nameInputEmail1" name="name" placeholder="Full name">
    </div>
    <div class="form-group">
        <label for="exampleInputEmail1">Email address</label>
        <input type="email" class="form-control" id="exampleInputEmail1" name="email"
               placeholder="Enter email">
    </div>
    <div class="form-group">
        <label for="messageInputEmail1">Message</label>
        <textarea type="textarea" class="form-control" id="messageInputEmail1" name="message"
                  placeholder="Enter message"></textarea>
    </div>
    <p class="thanks">Thanks!  We'll contact you soon.</p>
    <button type="submit" class="btn btn-primary">Submit</button>
</form>