html, body, td, th {
  margin: 0;
  padding: 0;
}

#board-wrapper, #board {
  border-spacing: 0;
  float: left;
  height: 100vh;
  width: 100vh;
}

.tile {
  background-color: #fff;
  font-size: 6vh;
  height: 12.5vh;
  width: 12.5vh;
  text-align: center;
}

.row:nth-child(even) .tile:nth-child(odd),.row:nth-child(odd) .tile:nth-child(even) {
  background-color: #777;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
}