hex.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Color flipper</title>
</head>
<link href="index.css" rel="stylesheet">
<body>
    <nav>
        <div class="nav-center">
            <h4>Color flipper</h4>
            <ul class="nav-links">

                <li><a href="hex.html">Hex</a></li>
                <li><a href="index.html">Simple</a></li>
                
            </ul>
        </div>
    </nav>
    <main>
        <div class="container">
            <h2>Background color: <span class="color"> gm</span> </h2>
            <button class="btn btn-hero" id="btn">CLICK ME MOWA!</button>
        </div>
    </main>

    <script src="hex.js"></script>
</body>
</html>