html, body { margin: 0; height: 100%; background: #c9d6e2; }
three-d-stage:not(:defined) { visibility: hidden; }

.nav, #picker {
  position: fixed; z-index: 11;
  display: flex; flex-wrap: wrap; gap: 6px;
  font: 500 12px/1 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.nav { top: 12px; left: 12px; }
#picker { top: 48px; left: 12px; }

.nav a, #picker button {
  appearance: none; cursor: pointer; text-decoration: none;
  padding: 7px 12px; border-radius: 7px;
  border: 1px solid rgba(32, 30, 29, .14);
  background: rgba(255, 255, 255, .82);
  backdrop-filter: blur(3px);
  color: #3a4148; letter-spacing: .01em;
}
.nav a:hover, #picker button:hover { background: #fff; }
.nav a.on, #picker button.on {
  background: #201e1d; border-color: #201e1d; color: #f3f2f2;
}