view.css

.faceted-zero-count-hidden .faceted-alphabetic-letter-disabled {
  display: none;
}

.faceted-top-column .faceted-alphabetic-widget {
  text-align: center;
}

.faceted-center-column .faceted-alphabetic-widget {
  text-align: center;
}

.faceted_letter {
  color: #95B229;
  font-weight: bold;
  font-size: 1.2em;
  cursor: pointer;
  padding: 0 0.2em 0 0.2em;
  background-color: transparent;
}

.faceted_letter:hover{
  color: orange;
  background-color: #ccc;
}

.faceted_letter_selected {
  background-color: #ccc;
  color: orange;
  font-size: 1.7em;
}

.faceted-alphabetic-letter-disabled {
  color: gray;
  cursor: auto;
}

.faceted-alphabetic-letter-disabled:hover{
  color: gray;
  background-color: transparent;
}