.floating-wa{
  position:fixed; right:16px; bottom:16px; z-index:9999;
  width:56px; height:56px; display:flex; align-items:center; justify-content:center;
  background:#25D366; border-radius:50%; box-shadow:0 10px 24px rgba(0,0,0,.15);
}
.floating-wa:hover{ filter:brightness(0.95); }