> For the complete documentation index, see [llms.txt](https://docs.whiteswan.io/partner-knowledge-base/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.whiteswan.io/partner-knowledge-base/branding-and-white-labeling/branding-and-design/layout-and-surfaces.md).
# Layout & Surfaces
Layout & Surfaces define the foundational look of the interface—backgrounds, boxes, separators, and box shadows.
***
#### What you can customize
**Backgrounds**
* Light mode background color
* Dark mode background color
* When you define a custom background color, we do a [WCAG color contrast check](https://accessibleweb.com/color-contrast-checker/), and you're only able to save the color if contrast is higher than 3:1.
**Boxes**
* Box (card) color
* Dark mode box color
* When you define a custom box color, we only allow light colors to be selected, and you're only able to save the color if it passes a test.
* Customize box shadows (via “Edit Box Shadows”), which let you edit aspects such as:
* Blur
* Spread
* X/Y offset
* Color - using less than 100% opactiy is recommended
**Separators**
* Divider / separator color
* Dark mode separator color
***
#### How it works
* Background = overall canvas
* Box color = cards, containers, panels
* Shadows add depth and hierarchy between elements
* Dark mode settings operate independently
***
#### Tips
* Use **subtle shadows** to create depth without clutter
* Keep strong contrast between background and boxes
* Avoid overly saturated backgrounds—let content stand out
---
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