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Dummy CSS Variable Set Generator

CSS custom properties are the backbone of scalable, maintainable stylesheets, and this dummy CSS variable set generator gives you a complete :root declaration block in seconds. Instead of hand-writing dozens of tokens from scratch, you get a ready-made set covering colour palettes, spacing scales, typography sizes, border radii, box shadows, and transition timings — all structured as real design tokens. Pick a theme type and your own variable prefix, and the output slots directly into any project. Design token systems live and die by consistency. Having a full set of CSS variables defined upfront means your components all reference the same source of truth, making global changes — like swapping a brand colour or adjusting your base spacing unit — a one-line edit rather than a find-and-replace nightmare across hundreds of files. The generator supports multiple theme flavours: light, dark, brand, minimal, and a full design-system set. Each theme outputs tokens that are semantically grouped, so colours are separate from spacing, which is separate from typography. This mirrors the structure used in production design systems like Material Design and Radix UI, making the output familiar and immediately usable. Whether you are scaffolding a new component library, setting up a Storybook theme, or just need a realistic CSS variable set for a prototype, this tool cuts the boilerplate and gets you to working code faster. Combine the output with a CSS preprocessor or a build-time token pipeline and you have a solid foundation for any frontend project.

How to Use

  1. Select a theme type from the dropdown — choose light, dark, brand, minimal, or full design-system based on what your project needs.
  2. Enter a variable prefix in the text field that matches your project naming convention, such as --app, --brand, or --ui.
  3. Click the generate button to produce a complete :root block of CSS custom property declarations.
  4. Copy the output and paste it into your global CSS file, a dedicated tokens.css, or your design system's base stylesheet.
  5. Adjust individual token values as needed to match your brand colours, type scale, or spacing system.

Use Cases

  • •Scaffolding :root token files for new React or Vue component libraries
  • •Generating paired light and dark theme variable sets for a single codebase
  • •Creating realistic CSS variables for Storybook or Figma token imports
  • •Populating a design system starter kit with spacing and typography scales
  • •Building a quick brand theme using a custom --brand variable prefix
  • •Producing placeholder CSS tokens for UI mockups and client presentations
  • •Testing CSS variable inheritance behaviour across nested components
  • •Replacing hardcoded values in legacy stylesheets with structured token sets

Tips

  • →Generate both a light and dark theme with the same prefix, then layer them using :root and [data-theme='dark'] selectors for instant theme switching.
  • →Use the full design-system theme as a checklist — it reveals which token categories (elevation, motion, borders) you may have forgotten in your own system.
  • →Name your prefix after your npm package scope (e.g. --acme if your package is @acme/ui) to keep tokens traceable back to their library.
  • →After generating, run the output through a CSS linter like Stylelint to catch any token names that conflict with existing project variables before committing.
  • →Pair the generated spacing scale tokens with a CSS Grid or Flexbox layout system so gap and padding values always reference the same scale, keeping vertical rhythm consistent.
  • →For Figma-to-code workflows, match the generated token names to your Figma variable names — this makes token sync tools like Token Studio work with minimal remapping.

FAQ

What CSS properties does the generator produce?

The output includes colour palette tokens (primary, secondary, neutral, semantic states), spacing scale values, font sizes, font families, line heights, border radii, box shadow levels, and transition duration and easing tokens. The exact set varies slightly by theme type, with the full design-system theme producing the most complete output.

How do I use CSS variables in my stylesheet after generating them?

Paste the generated :root block into your global CSS file or a dedicated tokens.css file. Reference any variable with var(--your-prefix-token-name). For example, if your prefix is --app and you have a primary colour token, use color: var(--app-color-primary) anywhere in your styles.

What is the best prefix convention for CSS variables?

Use a short, project-specific prefix like --app, --brand, or an abbreviated project name such as --ds. Avoid generic prefixes like --css or --var. A consistent prefix prevents collisions with third-party libraries and makes it easy to identify your tokens in browser DevTools.

How do I switch between light and dark themes using CSS variables?

Generate both a light and a dark variable set using the same prefix. Place the light set inside :root and the dark set inside a [data-theme='dark'] selector or a @media (prefers-color-scheme: dark) block. Toggle the attribute on your root element via JavaScript or let the media query handle it automatically.

Can I use the generated variables with Tailwind CSS or CSS Modules?

Yes. Paste the :root block into your global stylesheet so the variables are available everywhere. In Tailwind, reference them inside tailwind.config.js using var(--your-token) as a colour or spacing value. In CSS Modules, call them with var() just like any other CSS variable since they are globally scoped.

What is the difference between a design token and a CSS variable?

A design token is a named, platform-agnostic value representing a design decision (like 'primary colour'). A CSS variable is a specific implementation of that token in CSS. This generator produces CSS variables that already follow design token naming conventions, so they are ready for token-based workflows without extra transformation.

Are the generated CSS variables compatible with all modern browsers?

CSS custom properties are supported in all modern browsers including Chrome, Firefox, Safari, and Edge. They are not supported in Internet Explorer 11. If you need IE11 support, you will need a PostCSS plugin like postcss-custom-properties to compile the variables into static values at build time.

How do I add these CSS variables to an existing project without conflicts?

Choose a unique prefix that does not match any variables already in your codebase. Add the generated :root block to a new tokens.css file and import it first in your main stylesheet so subsequent files can override individual tokens if needed. Check your browser DevTools computed styles to confirm no naming collisions.