jsFiddle Bootstrap 3.3.6 + jQuery 2.2 + FontAwesome

Bootstrap and jQuery and FontAwesome jsFiddle template - maxcdn complete

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.2/css/bootstrap-select.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.2/js/bootstrap-select.min.js"></script>
       
    <form action="" id="FormMessage"  method="post">
        <div style="max-width:700px;">
            <div id="DivMessage" class="txt-l" style="max-width:600px;">
                <div class="row" style="margin:0px;">
                    <div class="col-sm-6" style="padding:0px;">
                        <input name="InputName" id="InputName" class="name" type="text" width="100%" placeholder="Your name" required>
                    </div>
                    <div class="col-sm-6" style="padding:0px;">
                        <input name="InputEmail" id="InputName" class="email" type="text" width="100%" placeholder="Your email" required>
                    </div>
                </div>

               <div>
                  <input name="InputSubject" id="InputSubject" class="subject" type="text" placeholder="Subjet" required>
               </div>
                <div>
                    <textarea name="TextareaBody" id="TextareaBody" class="message" rows="7" placeholder="Your Message" required></textarea>
                </div>
                <div class="pad-t-20 txt-c">
                    <button id="BtMessage" class="btn btn-primary">Send</button>
                </div>
            </div>
        </div>
     </form>

CSS

body {
  padding: 40px;
}
.name, .email, .subject, .message {
    padding: 0 0 0 20px;
    background: #f8f8f8;
    width:100%;
    margin: 0;
    border-radius:0;
    height: 50px;
    border: 1px solid rgba(0,0,0,.1);
}
.email {
    border-left:0;
}
.subject {
    border-top:0;
}
.message {
    height: 13em;
    border-top:0;
    resize:vertical;
    padding: 20px 20px 20px 20px;
}

.name:focus, .email:focus, .subject:focus, .message:focus {
  outline: none;
  background: #ffffff;
  color: rgba(51,51,51,.8);
}

input:required {
    box-shadow:none;
}
input:invalid {
    box-shadow:none;
}
textarea:required {
    box-shadow:none;
}
textarea:invalid {
    box-shadow:none;
}