:root {
  --bg__header: #5c585524;
  --link: #1c221c;
  --header__txt: black;
}

:any-link {
  color: var(--link);
}

body {
  display: grid;
  grid-auto-flow: row;
  gap: 4px;
}

header {
  background-color: var(--bg__header);
  color: var(--header__txt);
  display: grid;
  justify-content: space-between;
  align-items: center;
  padding-inline: 1rem;
  grid-auto-flow: column;
  font-variant: small-caps;
}

main {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-flow: row;
  align-items: center;
}

div {
  display: grid;
  place-content: center;
  height: 15rem;
  margin: 0.5rem;
  border: 1px solid rgba(0, 0, 0, 0.3);
  box-shadow: inset 2px 4px 5px rgba(0, 0, 0, 0.3);
  font-size: 1.5rem;
}

span {
  text-shadow: 3px 3px 3px rgba(0, 0, 0, 0.4);
  font-family: sans-serif;
  color: grey;
  mix-blend-mode: difference;
}