body {
  display: flex;
  height: 100vh;
  margin: 0;
}

table.sudoku {
  border: medium solid black;
  border-collapse: collapse;
  margin: auto;
}
table.sudoku td {
  border: thin solid lightgray;
  height: 3rem;
  width: 3rem;
  vertical-align: middle;
  text-align: center;
}
table.sudoku td:nth-child(3n) {
  border-right: medium solid black;
}
table.sudoku tr:nth-child(3n) {
  border-bottom: medium solid black;
}/*# sourceMappingURL=sudoku.css.map */