* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "Inter", sans-serif;
}
.tile {
  background-size: cover;
  background-position: center;
  cursor: pointer;
}
.empty {
  background: transparent;
  cursor: default;
}
#puzzle {
  display: grid;
  gap: 2px;
  width: 100%;
  max-width: 90vmin;
  margin: auto;
}
.tile::after {
  content: "";
  display: block;
  aspect-ratio: 1 / 1;
}