.gol-grid { display: grid; grid-gap: 1px; background-color: #444; }
.gol-cell { background-color: #eee; width: 1.5rem; height: 1.5rem; box-sizing: border-box; cursor: pointer; }
.gol-cell.alive { background-color: #222; }
@media (max-width: 600px) {
  .gol-cell { width: 1rem; height: 1rem; }
}