.facebook-button {
  display: inline-block;
  margin-top: 20px;
  padding: 14px 20px;
  border-radius: 4px;
  background: #1877f2;
  color: #fff;
  text-decoration: none;
  font-weight: 800;
}
.facebook-button:hover { background: #1264cd; }
#dialog-content .facebook-button { margin-top: 12px; }