header a {
  background-color: #d32f2f;
}

article {
  background-color: #f8f8f8;
  border-left: 4px solid #d32f2f;
}

article.card {
  transition: transform .2s;
}

article.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, .1);
}