Least amount of CSS

This is a clone of the original work of https://thecascade.dev/article/least-amount-of-css/ which now 404s. I like this minimal CSS and have used it in a lot of my projects.

 
html {
  color-scheme: light dark;
}
 
body {
  font-family: system-ui;
  font-size: 1.25rem;
  line-height: 1.5;
}
 
img,
svg,
video {
  max-width: 100%;
  display: block;
}
 
main {
  max-width: min(70ch, 100% - 4rem);
  margin-inline: auto;
}