nested-container-frames

Define an outer centered container that controls global page width, add visible vertical boundary lines and corner markers, then place inner containers inset with consistent padding. Give each inner level its own background, border, and border radius to separate the layers.

Use a frame hierarchy instead of stacking cards: an outer frame establishes page bounds, and inner frames with their own backgrounds and spacing rhythm separate hero, feature, proof, and CTA modules. This avoids the boxed-in feeling of cards inside cards.

Apply vertical border lines to the outer centered container along with small corner markers to establish the frame. Keep the lines subtle so they define structure without overpowering content readability.

Avoid deep nesting when the layout starts to feel boxed in or when frame lines compete with content readability. The technique works best with one outer frame and one level of inset inner containers, not multiple stacked layers.

Yes, the outer container controls global width and inner containers use padding-based inset spacing, which adapts naturally across breakpoints. The included demo demonstrates responsive behavior from mobile to desktop with reduced-motion support.