body{
    max-width:650px;
    margin:40px auto;
    padding:0 10px;
    font:18px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    color:#444
}
h1,h2,h3{
    line-height:1.2
}
@media (prefers-color-scheme: dark){
    body{color:white;background:#444}
    a:link{color:#5bf}
    a:visited{color:#ccf}
}