.alert {
  color: mix(red, black, 50%);
  background-color: mix(red, white, 50%);
  border: 1px solid mix(red, black, 25%)
}

.notice {
  color: mix(green, black, 50%);
  background-color: mix(green, white, 50%);
  border: 1px solid mix(green, black, 25%)
}