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<!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="styles.css">
    <title>CSS3 Layout</title>
</head>
<body>
    <header>
        <h1>Header</h1>
    </header>
    <nav>
        <ul>
            <li><a href="#">Home</a></li>
            <li><a href="#">About</a></li>
            <li><a href="#">Services</a></li>
            <li><a href="#">Contact</a></li>
        </ul>
    </nav>
    <main>
        <section class="content">
            <h2>Main Content</h2>
            <p>This is the main content of the webpage.</p>
        </section>
        <aside class="sidebar">
            <h3>Sidebar</h3>
            <p>This is the sidebar content.</p>
        </aside>
    </main>
    <footer>
        <p>&copy; 2023 Your Website</p>
    </footer>
</body>
</html>

/* Reset some default styling */
body, h1, h2, h3, p {
    margin: 0;
    padding: 0;
}

/* Basic layout styling */
body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
}

header {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em 0;
}

nav ul {
    list-style: none;
    background-color: #444;
    text-align: center;
}

nav ul li {
    display: inline;
    margin-right: 20px;
}

nav ul li a {
    color: #fff;
    text-decoration: none;
}

main {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    padding: 20px;
}

.content {
    flex: 2;
    padding-right: 20px;
    border-right: 1px solid #ddd;
}

.sidebar {
    flex: 1;
    padding-left: 20px;
}

footer {
    background-color: #333;
    color: #fff;
    text-align: center;
    padding: 1em 0;
}