body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    background-color: #f4f4f4;
}

h1 {
    text-align: center;
}

.subtitle {
    text-align: center;
    color: gray;
    margin-bottom: 30px;
}

.article {
    background: white;
    padding: 20px;
    margin-bottom: 20px;
    border-radius: 6px;
}

.article h3 {
    margin: 0 0 10px 0;
}