html, body { margin: 0; width: 100%; height: 100%; overflow: hidden; background: #111; font-family: system-ui, sans-serif; }
#modelframe { position: fixed; top: var(--site-header-height, 82px); left: 0; width: 100%; height: calc(100% - var(--site-header-height, 82px)); border: 0; z-index: 1; }
.demo-fallback { color: #eee; padding: 100px 24px; }
@media (max-width: 760px) { #modelframe { top: var(--site-header-height, 56px); height: calc(100% - var(--site-header-height, 56px)); } }