.fab{
  position:fixed;
  bottom:max(16px, env(safe-area-inset-bottom));
  z-index:60;
  width:60px;
  height:60px;
  border-radius:50%;
  display:flex;
  align-items:center;
  justify-content:center;
  color:#fff;
  box-shadow:0 8px 16px rgba(0,0,0,.18);
}
.fab svg{width:28px;height:28px}
.fab-wa{right:16px;background:#25d366}
.fab-call{left:16px;background:#2563eb}
@media (min-width:1024px){
  .fab-wa{right:5%}
  .fab-call{left:5%}
  .fab:hover{transform:scale(1.06)}
}