<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/chosen/1.5.1/chosen.min.css">
</head>
<body>
<div style="width:520px;margin:0px auto;margin-top:30px;">
<select class="livesearch" style="width:400px;">
<option>Expert PHP</option>
<option>Demo PHP</option>
<option>PHP Tutorials</option>
<option>PHP Framework</option>
<option>PHP Libraries</option>
<option>HTML</option>
<option>CSS</option>
<option>JS</option>
<option>MySQL</option>
</select>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/chosen/1.5.1/chosen.jquery.min.js"></script>
<script type="text/javascript">
$(".livesearch").chosen();
</script>
</body>
</html>