.wa-fab{position:fixed;right:20px;bottom:20px;z-index:40;display:flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:var(--radius-pill);background:var(--brand-600);color:#fff;box-shadow:var(--shadow-card)}
.wa-fab:hover{filter:brightness(.94)}
.wa-fab:focus-visible{outline:3px solid var(--brand-600);outline-offset:3px}

@media(max-width:640px){
  .wa-fab{right:16px;bottom:16px;width:52px;height:52px}
}