td {
  width: 25px;
  margin: 5px;
  text-align: center;
}

#word td {
  border-bottom: solid 1px black;
}

#word td.special {
  border-bottom: none;
}

#letters td {
  cursor: pointer;
}

#letters td:hover {
  text-decoration: underline;
  color: green;
  font-weight: bold;
}

#letters td.picked {
  text-decoration: line-through;
  color: gray;
  cursor: auto;
}