.whatsapp-fab{position:fixed;left:(100vw - min(100vw,var(--container-max))) /2 + var(--container-pad);bottom:calc(16px + env(safe-area-inset-bottom));z-index:9999;transition:transform .15s ease,box-shadow .15s ease}.whatsapp-fab:hover{transform:translateY(-1px) scale(1.04)}