#pixel-grid {
  display: grid;
  grid-template-columns: repeat(100, 10px);
  grid-template-rows: repeat(100, 10px);
  gap: 1px;
  width: 1000px;
  height: 1000px;
  border: 1px solid #333;
}

.pixel-block {
  width: 10px;
  height: 10px;
  background-color: #eee;
  cursor: pointer;
  background-size: cover;
}

.pixel-block.taken {
  cursor: not-allowed;
  opacity: 0.5;
}