body {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: start;
  align-items: center;
  font-family: sans-serif;
}

.board {
  margin-top: 10px;
  display: grid;
}

.square {
  width: 50px;
  height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
  font-weight: bolder;
  font-size: 1.5em;
}