html{color-scheme:light dark}
body{font:16px/1.6 system-ui,-apple-system,Segoe UI,sans-serif;margin:0;
     display:grid;place-items:center;min-height:100vh}
main{max-width:34rem;padding:2rem}
h1{font-size:1.4rem;margin:0 0 .5rem}
p{margin:.5rem 0;opacity:.8}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em}