.whatsapp-btn {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 50;
  width: 4rem;
  height: 4rem;
  border-radius: 9999px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 300ms ease;
}
@media (min-width: 640px) {
  .whatsapp-btn { width: 5rem; height: 5rem; }
}
.whatsapp-btn:hover { transform: scale(1.1); }

.whatsapp-btn__ping {
  position: absolute;
  inset: 0;
  border-radius: 9999px;
  background: rgba(37, 211, 102, 0.4);
}

.whatsapp-btn__icon {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: 9999px;
  object-fit: cover;
}