CSS

p {
  border-style: solid;
  border-width: 0.1rem;
  padding: 0.8rem;
}

.warning p {
  color: #721c24;
  background-color: #f8d7da;
  border-color: #f86d7b;
}

.validation p {
  color: #155724;
  background-color: #d4edda;
  border-color: #4eea72;
}

.info p {
  color: #004085;
  background-color: #cce5ff;
  border-color: #459cf9;
}