사용자:낙엽1124/연습장/styles.css

.container {
  display: grid;
}

.container.tree-columns {
  grid-template-columns: repeat(3, 1fr);
}

.container.four-columns {
  grid-template-columns: repeat(4, 1fr);
}

.container div {
  width: 3em;
  height: 3em;
  border-radius: 0.5em;
  background-color: cyan;
  border: 0.2em solid black;
}