.board {
  padding: 0;
  margin: 0;
  border: 3px solid #000000;
}

.board td {
  width: 1em;
  height: 1em;
  border-right: 1px solid #000000;
  border-bottom: 1px solid #000000;
  padding: 1px;
  margin: 0;
}


.board input {
  width: 1em;
  height: 1em;
  text-align: center;
  font-size: 1em;
  background-color: #fffffff;
  margin: 0;
  border: 0;
}

.board td.topRightLine {
  border-right: 2px solid #000000;
  border-bottom: 2px solid #000000;
  padding-top: 0;
} 

.board td.leftLine {
  border-left: 2px solid #000000;
  padding-left: 0;
} 
.board td.rightLine {
  border-right: 2px solid #000000;
  padding-right: 0;
} 
.board td.topLine {
  border-bottom: 2px solid #000000;
  padding-top: 0;
} 
.board td.bottomLine {
  border-bottom: 2px solid #000000;
  padding-bottom: 0;
} 

.cell {
  color: #0000ff;
}