index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="style.css">
    <title>Avatar</title>
</head>

<body>

    <div class="container">
        <header>
            <h1>Avatar</h1>
            <ul>
                <li>Home</li>
                <li>Calns</li>
                <li>Videos</li>
                <li>About</li>
            </ul>
        </header>

        <div class="content">
            <h2>Avatar</h2>
            <p>
                Lorem ipsum dolor sit amet consectetur adipisicing elit. 
                Repudiandae earum, similique sit libero nam
                nesciunt modi at quas optio repellat, nemo quia odit, 
                ipsa soluta molestias sapiente odio amet officia.
            </p>
            <button>Click here</button>
        </div>

    </div>

</body>

</html>