html,
body {
    margin: 0;
    padding: 0;
}

body {
    max-width: 720px;
    margin: 80px auto;
    padding: 0 20px;

    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Ubuntu,
        sans-serif;

    font-size: 18px;
    line-height: 1.7;

    color: #222;
    background: #fafafa;

    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

nav {
    margin-bottom: 64px;
}

nav a {
    margin-right: 24px;

    text-decoration: none;
    color: inherit;

    font-weight: 500;
}

nav a:hover {
    text-decoration: underline;
}

h1 {
    margin-top: 0;
    margin-bottom: 24px;

    font-size: 2.75rem;
    font-weight: 600;
    line-height: 1.2;
}

h2 {
    margin-top: 48px;
    margin-bottom: 12px;

    font-size: 1.4rem;
    font-weight: 600;
}

p {
    margin-bottom: 20px;
}

section {
    margin-bottom: 48px;
}

a {
    color: inherit;
}

@media (max-width: 768px) {
    body {
        margin: 40px auto;
        padding: 0 16px;
    }

    h1 {
        font-size: 2.2rem;
    }
}