.hoverable {
  border: none;
  border-radius: 6px;
  padding: 2px 10px;
  margin: 10px 0px 10px 25px;
  font-size: 1.2em;
  background-color: #67d665;  /* lighter green */
  color: black;
  box-shadow: 3px 3px #669966;  /* darker green */
  transition: 500ms;
}

.hoverable:hover {
  box-shadow: 0 0;
  background-color: #669966;   /* darker green */
}