html {
  color-scheme: light dark;
}

body {
  font-family: system-ui;
  font-size: 1.125rem;
  line-height: 1.5;
}

main {
  max-width: 45ch;
  margin: 2rem 3rem;
  padding: 2rem;
  border: solid 2px red;
  border-radius: 20px;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}