.sg-board {
  display: grid;
  gap: 3px;
  margin: 8px auto;
  width: max-content;
  background: #dde4ee;
  padding: 5px;
  border-radius: 10px;
}
.sg-cell {
  width: 40px;
  height: 40px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  font-weight: 800;
  font-size: 18px;
  color: #25323f;
  transition: transform .08s;
}
.sg-cell:active { transform: scale(.94); }
.sg-cell.given { color: #111; }