UI Design

Comprehensive guide for building, styling, and using components in the frontend.

References

When styling components, use packages/frontend/@n8n/design-system/src/styleguide/*.mdx
For animations, use rules/web-animation-guidelines.md
When reviewing UI changes, use rules/web-interface-guidelines.md

ALWAYS use CSS variables from _tokens.scss or _primitives.scss in packages/frontend/@n8n/design-system/src/css/. Look up every length, color, font-size and duration before you write it as a literal. Each spacing token carries its px value in a comment: --spacing--5xs: 0.125rem; /** 2px **/. Grep that comment to find the token for a px value. The grep gives one hit for each token family, so pick the family that matches the property: --spacing--* for margin and padding, --radius--* for border-radius, --height--* for height. The styleguide packages/frontend/@n8n/design-system/src/styleguide/spacing-size.mdx lists the same scale as a table. The spacing scale starts at 2px, so a small value is not a reason to hardcode. Hardcode only if the lookup finds no token. Give the reason in a comment.
ALWAYS prefer using existing components from packages/frontend/@n8n/design-system/src/components. Prefer components that aren't marked @deprecated.
If you need to add hover/active alpha behavior to solid components, prefer color-mix() with explicit percentages.
When working with animations or transitions, ALWAYS prefer using mixins from packages/frontend/@n8n/design-system/src/css/mixins/motion.scss

Use existing design-system components over creating custom implementations:

"Add a modal dialog for confirming workflow deletion" → Use N8nDialog
"Add a dropdown to select workflow status" → Use N8nDropdown or N8nSelect
"Add button with + icon to add new tiem" → Wrap N8nButton with iconOnly prop with N8nTooltip and wrap in N8nTooltip. Use N8nIcon and proper aria-label.
"Add a destructive action button" → use N8nButton with variant="destructive"
"Make background color white/black" → Use var(--background--surface) for white on light mode and "black" on dark mode
"Animate the title in gracefully" -> Use fade-in-up mixin from motion.scss with var(--duration--base)