.game {
  margin: 50px auto;
  padding: 30px;
  background-color: #eee;
  font-family: system-ui;
  width: 320px;
  height: 410px;
  text-align: center;
  max-height: 100vh;
}

.game h2 {
  text-transform: uppercase;
  color: white;
  font-size: 30px;
  height: 45px;
  transition: 0.2s;
  font-weight: bold;
  background-color: dodgerblue;
  width: 310px;
}
.game h2 span {
  color: greenyellow;
}

.square {
  width: 100px;
  height: 100px;
  background-color: dodgerblue;
  float: left;
  margin: 2px;
  transition: 0.2s;
  font-size: 50px;
  text-transform: uppercase;
  color: white;
  display: flex;
  justify-content: center;
  align-items: center;
}
.square:hover {
  background-color: gray;
}

@media (max-width: 768px) {
  .game {
    width: 300px;
  }
  .square {
    width: 96px;
  }
}
/* <!-- Another Solution --> */
/* .board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  width: 300px;
  height: 300px;
  margin: auto;
}

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

.x {
  color: blue;
}

.o {
  color: red;
} */