section>header {
  font-size: 1.5em;
}

.error {
  background: #f77;
}

.warning {
  background: #ff7;
}

.safe {
  background: #7f7;
}

.button {
  -webkit-appearance: button;
  -moz-appearance: button;
  appearance: button;

  text-decoration: none;
  color: initial;
  padding: .1em;
}