#whatsapp-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    width: 60px;
    height: 60px;
    background-color: #25d366;
    border-radius: 50%;
    text-align: center;
    box-shadow: 2px 2px 5px rgba(0,0,0,0.3);
}

#whatsapp-button a {
    display: block;
    width: 100%;
    height: 100%;
    color: #ffffff;
    font-size: 30px;
    line-height: 60px;
}

#whatsapp-button a:hover {
    color: #ffffff;
}


#whatsapp-button .whatsapp-tooltip {
  position: absolute;
  right: 70px; /* distanza dal cerchio */
  bottom: 50%;
  transform: translateY(50%);
  background: #222;
  color: #fff;
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 14px;
  line-height: 1.2;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}

#whatsapp-button .whatsapp-tooltip::after {
  content: "";
  position: absolute;
  right: -6px;
  top: 50%;
  transform: translateY(-50%);
  border: 6px solid transparent;
  border-left-color: #222;
}

/* quando ha la classe show-tooltip diventa visibile */
#whatsapp-button.show-tooltip .whatsapp-tooltip {
  opacity: 1;
}