* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
}
body {
  font-family: sans-serif;
  background-color: blanchedalmond;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  text-align: center;
  overflow: hidden;
}
.board-container {
  border: 10px solid black;
}
.board {
  width: 90vmin;
  height: 90vmin;
  max-width: 100vw;
  max-height: 100vh;
}