.pwa-install-button[hidden] { display: none; }
.pwa-install-button {
  position: fixed;
  z-index: 95;
  right: max(18px, env(safe-area-inset-right));
  bottom: max(18px, env(safe-area-inset-bottom));
  min-height: 40px;
  padding: 0 15px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 12px;
  background: #253754;
  color: #fff;
  box-shadow: 0 12px 32px rgba(20,33,52,.22);
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 750;
}
.pwa-install-button:hover { background: #304766; transform: translateY(-1px); }
.pwa-install-button span { margin-right: 5px; font-size: 15px; }
@media (max-width: 820px) {
  .pwa-install-button { bottom: calc(78px + env(safe-area-inset-bottom)); }
}
@media (display-mode: standalone) {
  .pwa-install-button { display: none !important; }
}