html { font-family: -apple-system,BlinkMacSystemFont,segoe ui,Roboto,helvetica neue,Arial,sans-serif,apple color emoji,segoe ui emoji,segoe ui symbol; }
main { max-width: 800px; margin: 0 auto; }
a, a > img, label > img { -webkit-tap-highlight-color: rgba(0,0,0,0.4); cursor: pointer; }
h1+p.sub { font-weight: 200 }