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Preserve the tape shadow over scrolling content
showcase/deploy Live at https://showcase.andrefiedler.de/2608_BuB/
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André Fiedler
2026-09-07 18:40:44 +02:00
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# Implementation and maintenance
The supplied 1200 × 900 PDF and its IDML source define the desktop composition. All original design files are preserved under `design/`. The photographic backdrop and construction tape are extracted together to preserve the print export's crop, tint and shadows. This background stays fixed to the viewport above 1024 px. A foreground layer masks the same original pixels to the tape outline so content scrolls behind the band; it does not intercept pointer events. On smaller screens the background and tape scroll with the page. The logo and Lumios Marker heading retain their original outlines as SVG artwork; all other content is semantic, selectable HTML in `index.html`.
The supplied 1200 × 900 PDF and its IDML source define the desktop composition. All original design files are preserved under `design/`. The photographic backdrop and construction tape are extracted together to preserve the print export's crop, tint and shadows. This background stays fixed to the viewport above 1024 px. A foreground layer masks the same original pixels to the tape outline and its soft shadow so content scrolls behind both; it does not intercept pointer events. `construction-tape-mask.svg` uses the original tape paths and the IDML shadow's 35% opacity, 2.7895 pt offsets and 3.945 pt blur size. Reusing the background pixels preserves uncovered artwork without applying its shadow twice. On smaller screens the background and tape scroll with the page. The logo and Lumios Marker heading retain their original outlines as SVG artwork; all other content is semantic, selectable HTML in `index.html`.
CSS lives in `assets/styles.css`; all colors are CSS custom properties. Its link in `index.html` carries a content-hash query parameter; update that value when the CSS changes to avoid stale browser caches. Layout scales with the design above 1024 px. At smaller sizes the type becomes larger and wraps; at 600 px the bank and PayPal details stack in their original reading order. The mobile background separates the supplied tape from the photograph so that it remains above the logo while the photo fills a tall page. `assets/app.mjs` only enhances the IBAN with clipboard support and an accessible selection fallback. Contact and payment links work without JavaScript.