#board table {
  border: 1px black solid;
}

#board table td, #board table th {
  border: 1px black solid;
}

#board table th {
  text-align: center;
}

#board table.fourrowzerog {
  border: 1px #777777 solid;
}

#board table.fourrowzerog td, #board table.fourrowzerog th {
  border: 1px #777777 solid;
}