table {
  border-collapse: collapse;
  margin-top: 20px;
}

td {
  width: 60px;
  height: 40px;
  text-align: center;
  border: 1px solid #333;
  cursor: pointer;
}

select {
  width: 55px;
}

#copyBtn {
  padding: 5px 10px;
  cursor: pointer;
}