CSS Website Layout

<!DOCTYPE html>
<html>
<head>
    <style>
        * { box-sizing: border-box; }
        body { font-family: sans-serif; margin: 0; background: #f8fafc; }
        header { background: #0d2e5c; color: white; padding: 25px; text-align: center; }
        nav { background: #1e3a8a; padding: 10px; text-align: center; }
        nav a { color: #fca311; text-decoration: none; margin: 0 12px; font-weight: bold; }
        .row { display: flex; flex-wrap: wrap; padding: 20px; max-width: 900px; margin: auto; gap: 20px; }
        .main-col { flex: 3; min-width: 280px; background: white; padding: 20px; border-radius: 8px; }
        .side-col { flex: 1; min-width: 200px; background: #e0f2fe; padding: 20px; border-radius: 8px; }
        footer { background: #071a35; color: #94a3b8; text-align: center; padding: 15px; margin-top: 20px; }
    </style>
</head>
<body>

    <header><h1>Skillance Academy Portal</h1></header>
    <nav><a href="#">Beranda</a> <a href="#">Tutorial</a> <a href="#">Bursa</a></nav>
    <div class="row">
        <div class="main-col">
            <h2>Artikel Utama</h2>
            <p>Tata letak responsif dua kolom yang dibangun dengan Flexbox modern.</p>
        </div>
        <div class="side-col">
            <h3>Sidebar</h3>
            <p>Widget berita dan informasi.</p>
        </div>
    </div>
    <footer>&copy; 2026 Skillance Academy Indonesia</footer>

</body>
</html>