box.css

td {
  width: 200px;
  height: 200px;
}
.td-one {
  border-left: 1px solid black;
  border-right: 1px solid black;
}
.td-two {
  border-top: 1px solid black;
  border-bottom: 1px solid black;
}
table {
  margin: 5px auto;
}