body {
	font-family: sans-serif;
}

#container {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  grid-gap: 1rem;
}

#container > div {
  background: #eee;
  padding: 1rem;
  border-radius: 1em;
}

#container > div::before {
  content: "";
  padding-bottom: 100%;
  display: block;
}
.entry {
	position: relative;
}
.number {
	position: absolute;
	font-size: 10rem;
	color: #ccc;
	top: 1rem;
	left: 1rem;
}