:root{color-scheme:light dark;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;padding:2rem;line-height:1.5}main{max-width:640px;margin:0 auto}button{font:inherit;padding:.5rem 1rem;border-radius:6px;border:1px solid;background:transparent;cursor:pointer}button:hover{opacity:.85}a{color:inherit}pre{background:hsla(0,0%,50%,.12);padding:1rem;border-radius:6px;overflow:auto}