:root {
  --light-green: #e8f5e8;
  --dark-green: #2d5a27;
}

header a {
  background-color: var(--dark-green);
  color: #fff;
}

article {
  border-left-color: var(--dark-green);
  background-color: var(--light-green);
}

article > * {
  display: block;
}