body {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.game {
  width: 50%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.row {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.box {
  width: 100px;
  height: 100px;
  border: 1px solid black;
}