body {
  display: grid;
  justify-content: center;
}

#gameBoard {
  width: 450px;
  display: grid;
  grid-template-columns: repeat(3, 150px);
  grid-template-rows: repeat(3, 150px);
}
.gamePiece {
  border: 1px solid black;
  font-size: 100px;
  display: flex;
  justify-content: center;
}
#winnerContainer {
  margin-top: 30px;
  font-size: 50px;
  display: flex;
  justify-content: center;
}

@media (max-width: 600px) {
  body {
    display: grid;
    justify-content: center;
    background-color: black;
  }

  #appTitle {
    color: white;
    display: flex;
    justify-content: center;
  }
  h1 {
  }
  #gameBoard {
    margin-top: 100px;
    padding-top: 25px;
    background-color: #1f1f1f;
    border-radius: 40px;
    /*width: 345px;*/
    height: 400px;
    width: 400px;
    display: grid;
    justify-content: center;
    grid-template-columns: repeat(3, 115px);
    grid-template-rows: repeat(3, 115px);
  }
  .gamePiece {
    border: 1px solid white;
    border-radius: 5px;
    font-size: 100px;
    color: white;
    display: flex;
    justify-content: center;
  }
  #winnerContainer {
    margin-top: 30px;
    font-size: 50px;
    display: flex;
    justify-content: center;
    color: white;
  }
}