JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
  <style>
body { font-size:14px; }
</style>
  <script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
  
                    
<ul class="topnav">
    <li>Madde 1</li>
    <li>Mad              de 2 
        <ul><li>İçiçe Madde 1</li><li>İçiçe Madde 2</li><li>İçiçe Madde 3</li></ul>
       </li>
    <li>Madde 3</li>
</ul>

<script>$("ul.topnav > li").css("border", "3px double blue");</script>

</body>
</html>