:root { color-scheme: light dark; }

body {
  margin: 0;
  font: 16px/1.6 system-ui, sans-serif;
  display: grid;
  place-items: center;
  min-height: 100vh;
}

main { text-align: center; }

button {
  font: inherit;
  padding: 8px 16px;
  border: 1px solid currentColor;
  border-radius: 8px;
  background: transparent;
  color: inherit;
  cursor: pointer;
}