body {
    font-family: 'Segoe UI', sans-serif;
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f4f4f4;
}

header {
    background: #333;
    color: white;
    padding: 2rem;
    text-align: center;
    border-radius: 8px;
}

button {
    background: #ff5733;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
}