Kumo Design

Cloudflare Design

Apply these rules when designing, implementing, or reviewing Cloudflare product interfaces. Follow recommended examples and avoid patterns marked as examples to avoid.

Rules

content-text-size Use 14px for content text

All content text—body, buttons, data, other interactables—must be 14px in size. 16px and above are restricted to headings and subheadings.

Good

<Text>Content text</Text>

Avoid

<Text size="lg">Content text</Text>

heading-case Always sentence case headings

Never capitalize or uppercase headings. Product names must be title-cased.

Good

<Text as="h2">Recent requests</Text>

Avoid

<Text as="h2">Recent Requests</Text>

<Text as="h2" DANGEROUS_className="uppercase">
  Recent requests
</Text>

font-tracking Never change the font's tracking

Do not use the tracking-* classes to change the spacing between characters.

Good

<span className="text-lg">Worker Metrics</span>

Avoid

<span className="text-lg tracking-tight">Worker Metrics</span>

font-weight Never use font-bold

Use font-semibold for headings and font-medium for bold inline text.

Good

<Text as="h3" variant="heading3">Account settings</Text>
<Text as="strong" bold>required</Text>

Avoid

<Text as="h3" DANGEROUS_className="font-bold">Account settings</Text>
<Text as="strong" DANGEROUS_className="font-bold">required</Text>

related-text-spacing Put related text closer together

Related text should have smaller spacing around it than the content it belongs to.

Good

<div className="grid gap-6">
  <div className="grid gap-1.5">
    <Text as="h3">Web Analytics</Text>
    <Text>Measure site traffic without changing your code.</Text>
  </div>
  <Button>Configure</Button>
</div>

Avoid

<div className="grid gap-4">
  <Text as="h3">Web Analytics</Text>
  <Text>Measure site traffic without changing your code.</Text>
  <Button>Configure</Button>
</div>

text-spacing Optically align spacing around text

Spacing around text should take into account its line height. Typically this means vertical spacing should be slightly smaller than horizontal.

Good

<LayerCard className="px-5 py-4">...</LayerCard>

Avoid

<LayerCard className="p-5">...</LayerCard>

hover-color-transitions Never transition colors for hover states

Color changes on hover must be immediate. Transitions on fast interactions make the UI feel sluggish.

Good

<button className="hover:bg-kumo-tint">...</button>

Avoid

<button className="transition-colors duration-300 hover:bg-kumo-tint">
  ...
</button>

shadow-borders Never use borders with drop shadows

Use ring ring-kumo-line to create a transparent border that maintains sharp edges.

Good

<LayerCard className="shadow-md ring ring-kumo-line">...</LayerCard>

Avoid

<LayerCard className="border border-kumo-line shadow-md">...</LayerCard>

concentric-border-radius Use concentric border radii

When borders or rings are 8px or less apart, their corner radii must be mathematically concentric: outer radius = inner radius + padding.

Good

<div className="rounded-xl p-1">
  <div className="rounded-lg">...</div>
</div>

Avoid

<div className="rounded-xl p-1">
  <div className="rounded-xl">...</div>
</div>

icon-alignment Align icons with the first line of text

Inline icons must be optically the same size as and be center-aligned with text. Use h-lh flex items-center for multi-line alignment.

Good

<div className="flex items-start gap-2">
  <span className="h-lh flex items-center">
    <Icon />
  </span>
  <Text>Text that may wrap onto multiple lines</Text>
</div>

Avoid

<div className="flex items-start gap-2">
  <span className="flex items-center">
    <Icon />
  </span>
  <Text>Text that may wrap onto multiple lines</Text>
</div>

<div className="flex items-center gap-2">
  <Icon />
  <Text>Text that may wrap onto multiple lines</Text>
</div>

inline-monospace-size Reduce the font size of inline monospaced text

Monospaced text should have a slightly smaller font size (~0.9em) when mixed with regular text.

Good

<Text size="lg">
  Edit <span className="font-mono text-[0.9em]">wrangler.toml</span> to
  continue.
</Text>

Avoid

<Text size="lg">
  Edit <span className="font-mono">wrangler.toml</span> to continue.
</Text>

sticky-borders Use border to separate sticky elements from the content

Good

<div className="sticky top-0 border-b border-kumo-line">...</div>

Avoid

<div className="sticky top-0">...</div>

collapse-content-size Maintain content size during collapse animations

Collapsible content must maintain its content size while closing to avoid its content shifting during animations.

Good

<motion.div animate={{ width: open ? 256 : 0 }}>
  <div className="w-64">...</div>
</motion.div>

Avoid

<motion.div animate={{ width: open ? 256 : 0 }}>
  <div className="w-full min-w-0">...</div>
</motion.div>

layer-card-nesting Never stack LayerCard on top of one another

Good

<div>
  <Text as="h3">Recent requests</Text>
  <LayerCard>...</LayerCard>
</div>

Avoid

<LayerCard>
  <Text as="h3">Recent requests</Text>
  <LayerCard>...</LayerCard>
</LayerCard>

dialog-rendering Never conditionally render dialogs

Conditionally rendering dialogs disables their open/close animation. Use the open prop to determine if a dialog should be visible or not.

Good

<Dialog.Root open={open}
  <Dialog>
    <Dialog.Title>Edit Worker</Dialog.Title>
    <Dialog.Description>Update this Worker's settings.</Dialog.Description>
  </Dialog>
</Dialog.Root>

Avoid

{
  open && (
    <Dialog.Root open>
      <Dialog>
        <Dialog.Title>Edit Worker</Dialog.Title>
      </Dialog>
    </Dialog.Root>
  );
}