.whatsapp-float {
  position: fixed;
  z-index: 9999;
  right: 24px;
  bottom: max(24px, env(safe-area-inset-bottom));
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: #25d366;
  box-shadow: 0 5px 18px rgba(26, 90, 51, .3);
  color: #fff;
  transition: transform .2s, box-shadow .2s;
}
.whatsapp-float:hover { transform: translateY(-3px); box-shadow: 0 8px 22px rgba(26, 90, 51, .36); }
.whatsapp-float:focus-visible { outline: 3px solid #166b39; outline-offset: 4px; }
.whatsapp-float svg { display: block; width: 31px; height: 31px; fill: currentColor; }
@media (max-width: 600px) {
  .whatsapp-float { right: 16px; bottom: max(16px, env(safe-area-inset-bottom)); width: 54px; height: 54px; }
  .whatsapp-float svg { width: 29px; height: 29px; }
}