html,body { overflow:auto; height:auto; } #launch { display:none; } main { max-width:48rem; margin:2rem auto; padding:1rem; line-height:1.75; } img, video { max-width:100%; height:auto; } pre { overflow:auto; } .article-footer a { color:#666; text-decoration:none; } .article-footer a:focus-visible { text-decoration:underline; } @media (prefers-color-scheme:dark) { main { color-scheme:dark; color:#f9fafb; } main a { color:#8caaf0; } .article-footer a { color:#9a9a9a; } }

#选择器

CSS 小全