table {
  border-collapse: collapse;
  margin-bottom: 0.5cm;
}

td {
  border: 1px dotted black;
  width: 1.2cm;
  height: 1.2cm;
  text-align: center;
  vertical-align: center;
}

input[type="number"] {
  width: 1cm;
  box-sizing:  border-box;
}