:root { /* redundant; see meta tag in HTML */
  color-scheme: light dark;
}

* {
  box-sizing: border-box;
}

body {
  padding: 2em;
  max-width: 600px;
}

body, pre, textarea, button {
  font-size: 0.9em;
  font-family: 'Nimbus Mono PS', 'Courier New', 'Cutive Mono', monospace;
}

button {
  margin-top: 1em;
  margin-bottom: 1em;
  padding: 0.7em;
  cursor: pointer;
  border: 0;
  border-radius: 5px;
}

textarea {
  width: 100%;
  padding: 0.5em;
  min-height: 200px;
}