#board {
  width: 300px;
  height: 300px;
  display: grid;
  grid-template: repeat(3, 1fr) / repeat(3, 1fr);
}

[data-cell] {
  background-color: #f2f2f2;
  border: 1px solid #808080;
  font-size: 80px;
  text-align: center;
}

#announce-winner {
  font-size: 50px;
}

.shape {
  height: 50px;
  width: 50px;
}

.x {
  /* x stuff here */
  background-color: black;
}

.o {
  /* o stuff here */
  background-color: red;
}