span.hex.gray {
  background-color: gray;
}

span.hex.gray::before {
  border-bottom: 10px solid gray;
}

span.hex.gray::after {
  border-top: 10px solid gray;
}

span.hex.gray:hover {
  background-color: lightgray;
}

span.hex.gray:hover::before {
  border-bottom: 10px solid lightgray;
}

span.hex.gray:hover::after {
  border-top: 10px solid lightgray;
}