.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--white) 94%, transparent);
  box-shadow: 0 4px 0 color-mix(in srgb, var(--orange) 55%, transparent);
  backdrop-filter: blur(8px);
}

@media (max-width: 800px) {
  .topbar {
    background: var(--white);
  }
}