.grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  width: 610px;
  height: 610px;
  background-color: brown;
}

.grid div {
  width: 200px;
  height: 200px;
  background-color: white;
  margin-bottom: 5px;
}

.playerX {
  background-image: url('cross.png')
}

.playerO {
  background-image: url('circle.png') 

}