.cell {
  display: table-cell;
  width: 50px;
  height: 50px;
  vertical-align: middle;
	border-radius: 50%;
}

#bingo {
  display: table;
  margin: 20px auto;
}

.bingo {
  display: table-cell;
  width: 50px;
  height: 50px;
  vertical-align: middle;
  border-radius: 50%;
  background-color: red;
}

.bingo.done {
  background-color: blue;
}

.cell.selected {
	background-color: lightgreen;
}

.cell.selected:hover {
	background-color: lightseagreen;
}

.cell:hover {
	background-color: lightyellow;
}

#content {
	text-align: center;
}

.board {
	display: table;
	margin: 20px auto;
}

.board.hidden {
  display: none;
}