.btn.btn-share,
button.btn-share,
.share-x {
  background: #000;
  color: #fff;
  border-color: #000;
}

.btn.btn-share:hover:not(:disabled),
button.btn-share:hover:not(:disabled),
.share-x:hover {
  background: #000;
  color: #fff;
  border-color: #000;
  opacity: 0.85;
}