:root{font-family:system-ui,-apple-system,Helvetica Neue,Arial,Hiragino Sans,Hiragino Kaku Gothic ProN,Meiryo,sans-serif;line-height:1.5;color-scheme:light dark}body{margin:0;min-height:100dvh;display:grid;place-items:center}main{text-align:center;padding:2rem}