<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="container">
<div class="row justify-content-center align-items-center" style="height:100vh">
<div class="col-4">
<div class="card">
<div class="card-body">
<form action="" autocomplete="off">
<div class="form-group">
<input type="text" class="form-control" name="username">
</div>
<div class="form-group">
<input type="password" class="form-control" name="password">
</div>
<button type="button" id="sendlogin" class="btn btn-primary">login</button>
</form>
</div>
</div>
</div>
</div>
</div>
