body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    max-width: 700px;
    margin: 40px auto;
    padding: 0 20px;
    color: #333;
    line-height: 1.6;
}

h1 {
    border-bottom: 1px solid #eee;
    padding-bottom: 0.3em;
}

h2 {
    margin-top: 1.5em;
}