<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/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">
<h2>Bootstrap inline search button and Placeholder color change</h2>
</div>
<div class="row">
<div class="input-group">
<input type="text" placeholder="Search here" class="form-control box-placeholder">
<span class="input-group-append">
<button class="btn btn-info p-0 border-0 border px-4 font-weight-bold" type="button">
Search
</button>
</span>
</div>
</div>
</div>