:root {
  color-scheme: light dark;
}

body {
  margin: 1rem auto;
  padding: 0 1rem;
  max-width: 900px;
  background: light-dark(#fdfdfd, #000);
}

dfn {
  color: light-dark(purple, red);
}

pre {
  border: 1px solid light-dark(#000, #fff);
  padding: 1rem;
  overflow-x: scroll;
}

table {
  border-collapse: collapse;
}
table td, table th {
  border: 1px solid light-dark(#000, #fff);
}