<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<form action="#" name="myForm" method="post" onsubmit="return(validate());">
<div class="container-fluid">
<div class="row">
<div class="well center-block">
<div class="well-header">
<h3 class="text-center text-success"> Register Here! </h3>
<hr>
</div>
<div class="row">
<div class="col-md-12 col-sm-12 col-xs-12">
<div class="form-group">
<div class="input-group">
<div class="input-group-addon">
<i class="glyphicon glyphicon-user"></i>
</div>
<input type="text" placeholder="First Name" name="txtfname" class="form-control">
</div>
</div>
</div>
</div>
<div class="row">
<div class="col-xs-12 col-sm-12 col-md-12">
<div class="form-group">
<div class="input-group">
<div class="input-group-addon">
<i class="glyphicon glyphicon-user"></i>
</div>
<input type="text" placeholder="Last Name" name="txtlname" class="form-control">
</div>