body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5;
  margin: 0 auto;
  max-width: 40rem;
  padding: 1rem;
}

header nav a {
  margin-right: 1rem;
}

.lang {
  margin-top: 0.5rem;
}

.error {
  display: block;
  font-weight: bold;
}

.notice {
  border: 1px solid currentColor;
  font-weight: bold;
  padding: 0.5rem;
}

label {
  display: block;
  margin-top: 0.75rem;
}

input, select, button {
  font: inherit;
  margin-top: 0.25rem;
}

button {
  margin-top: 1rem;
}