JSFiddle - React, Tailwind, and code Playground

HTML

<script type="text/javascript"src='http://jqueryjs.googlecode.com/files/jquery-1.3.2.min.js'></script>
<script type="text/javascript"src='http://www.dotfier.com/sbox/cust_select_plugin.js'></script>
<link rel="stylesheet" type="text/css"href="http://www.dotfier.com/sbox/style.css">

<script>
    $(document).ready( function() {
          $(".select_field").custSelectBox();
          
      });
</script>

<p> SEARCH FOR DOMAIN</p>

<br>

<form action="http://www.dotfier.com/clients/domainchecker.php"method="post">
<input type="hidden" name="token"value="1b5d1710b655049cb85c82618c1b8c98aeec323f" />
<p>1. Inputbox : Type domain name<p> <input type="text" name="domain" size="20"/><br><br>

    
    
<p>2. Selectbox : Choose multiple domain extensions</p>    
<div class="select_wrap">
<select name="tlds[]" multiple="multiple" class="select_field">
<option value=".com">.com</option>
                            <option value=".org">.org</option>
                            <option value=".net">.net</option>
                            <option value=".us">.us</option>
</select>
</div><br><br>    

<p>3.Submit</p>    
<input type="submit" value="submit">
</form>