img {
  top: 21%;
  left:30%;
  transform: translate( -50%, -50%);
  position:absolute;
  filter:grayscale(100%);
}
#tictactoe { 
  width:300px;
  border: 25px solid transparent;
  padding: 104px;
  border-image-source: url(tic-tac-toe.png);
  border-image-repeat: round;
  border-image-slice: 20;
}