<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div class="simple-login-container">
<h2>Login Form</h2>
<div class="row">
<div class="col-md-12 form-group">
<input type="text" class="form-control" placeholder="Username">
</div>
</div>
<div class="row">
<div class="col-md-12 form-group">
<input type="password" placeholder="Enter your Password" class="form-control">
</div>
</div>
<div class="row">
<div class="col-md-12 form-group">
<input type="submit" class="btn btn-block btn-login" placeholder="Enter your Password" >
</div>
</div>
<div class="row">
<div class="col-md-12">
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</div>
</div>
</div>