body {
  background: url("../images/tictactoe.jpg") no-repeat fixed;
  background-size: cover;
  text-shadow: 1px 1px 2px red, 0 0 1em blue, 0 0 0.2em blue;
}

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  grid-gap: 10px;
  width: 300px;
  height: 300px;
  margin: auto;
}

.cell {
  border: 1px solid black;
  font-size: 50px;
  text-align: center;
  line-height: 100px;
  cursor: pointer;
}

.cell:hover {
  background-color: #eee;
}

.cell.x {
  color: red;
}

.cell.o {
  color: blue;
}

#title {
  text-align: center;
  margin-top: 50px;
}