* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #222;
    background: #fff;
    max-width: 640px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

h1 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

h2 {
    font-size: 1.1rem;
    margin-top: 2rem;
    margin-bottom: 0.5rem;
}

h3 {
    font-size: 1rem;
    margin-top: 1.25rem;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 0.75rem;
}

ul {
    margin: 0 0 0.75rem 1.25rem;
}

li {
    margin-bottom: 0.25rem;
}

a {
    color: #0066cc;
}

footer {
    margin-top: 3rem;
    font-size: 0.9rem;
}