100-the-game/theme.css

table.game-board td.even-cell {
  background-color: rgb(6, 42, 58);
}

table.game-board td.odd-cell {
  background-color: rgb(6, 42, 58);
}

table.game-board td.odd-cell.used-cell, table.game-board td.even-cell.used-cell {
  background-color: rgb(127, 71, 221);
}

table.game-board td.odd-cell.possible-cell, table.game-board td.even-cell.possible-cell {
  background-color: rgb(140, 198, 63);
}

table.game-board td.odd-cell.impossible-cell, table.game-board td.even-cell.impossible-cell {
}

table.game-board td.odd-cell.active-cell, table.game-board td.even-cell.active-cell {
  background-color: rgb(0, 169, 157);
}

table.game-board td.head-col, table.game-board td.head-row, table.game-board td.top-left {
    display: none;
}

#message {
    width: 80%;
}

#clock {
    width: 20%;
    padding: 10px;
}

body {
  font-family: "Bauhaus 93",Arial,Helvetica,sans-serif;
  background-color: rgb(0, 27, 39);
  text-align: center;
  color: white;
}

.logo {
    width: 80%;
}

table.game-info, table.game-board {
  border: 1px solid rgb(0, 27, 39);
  table-layout: fixed;
  width: 100%;
}

table td {
  padding: 0;
  overflow: hidden;
  text-align: center;
  vertical-align: middle;
}

table.game-board td {
  width: 10%;
  height: 10%;
}

table.game-info td {
    background-color: rgb(6, 42, 58);
}