html, body {
  margin: 0;
  box-sizing: border-box;
  display: flex;
  height: 100%;
  justify-content: center;
  align-items: center;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(10, 30px);
}

.game-cell {
  border: 1px solid black;
  aspect-ratio: 1;
}

.shaded {
  background-color: black;
}

.complete {
  background-color: red;
}

.empty {
  background-color: white;
}