body {
  margin: 0;
  background: black;
  line-height: 1;
}
board {
  display: block;
  font-size: 0;
  white-space: nowrap;
  user-select: none;
}
row {
  display: block;
  border-bottom: 1px solid black;
}
cell {
  display: inline-block;
  border-right: 1px solid black;
  height: 16px;
  width: 16px;
  cursor: default;
  position: relative;
}
cell:hover {
  box-shadow: inset 0 0 0 1px white;
  z-index: 1;
}
cell.live, cell.llchange::after {
  background-color: #8BC34A;
}
cell.dead, cell.live.llchange::after {
  background-color: #33691E;
}
cell.llchange::after {
  content: '';
  position: absolute;
  display: block;
  height: 4px;
  width: 4px;
  top: 6px;
  left: 6px;
  right: 6px;
  bottom: 6px;
}
cell.dying::after, cell.living::after {
  display: none;
}
cell.dying {
  background-color: #9C27B0;
}
cell.living {
  background-color: #FF9800;
}