html, body, .game-container {
  height: 100%;
}

.game-board {
  width: 400px;
  height: 400px;
  margin: 0 auto;
  background-color: #34495e;
  color: #fff;
  border: 6px solid #2c3e50;
  border-radius: 10px;

  display: grid;
  grid-template: repeat(3, 1fr) / repeat(3, 1fr);
}

.box {
  border: 6px solid #2c3e50;
  border-radius: 2px;
  font-family: Helvetica;
  font-weight: bold;
  font-size: 4em;
  display: flex;
  justify-content: center;
  align-items: center;
}

.game-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  row-gap: 20px;
}

#reset-button {
  max-width: 150px;
}