style.css

        body {
            background: #121212;
            color: white;
            font-family: sans-serif;
            padding: 2rem;
        }

        .btn {
            background: #00bfff;
            color: white;
            padding: 10px 20px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
        }

        .btn:hover {
            background: #009acd;
        }
    
    

    
index.html
        <h2>Buton Örnegi</h2>
        <button class="btn">Tıkla</button>