:root {
  color-scheme: light dark;
  font-family: system-ui, -apple-system, "Hiragino Sans", sans-serif;
  line-height: 1.6;
}

body {
  margin: 0 auto;
  max-width: 40rem;
  padding: 1rem;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

h1 {
  font-size: 1.25rem;
}

button {
  font: inherit;
  padding: 0.5rem 1rem;
}