body {
    max-width: 750px;
    margin: 30px auto;
    padding: 0 10px;
    font: 18px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    color: #444;
}

h1, h2, h3 {
    line-height: 1.2;
}

h1 .subtext, h2 .subtext, h3 .subtext {
    color: #999;
    font-size: 16px;
}