:root {
  --card-height: 14vh;
  --card-width: calc(var(--card-height) * (500/726));
  --gap-size: 1vw;
  font-family: system-ui;
  font-size: 1.2vw;
}

.tableau {
  display: grid;
  grid-template-rows: 3vw repeat(5, 16vh);
  justify-items: center;
  gap: var(--gap-size);
  background-color: green;
  color: lightgreen;
  padding: var(--gap-size);
}

.tableau > div { /* Child combinator */
  padding: var(--gap-size);
  touch-action: none;
}

.card-container {
  display: inline-block;
}

.card {
  touch-action: none;
  height: var(--card-height);
  width: var(--card-width);
  border: 1px solid #999999;
  border-radius: 3px;
  margin: var(--gap-size);
}