How to use CSS variables with Tailwind CSS

Is it possible to use CSS variables with Tailwind CSS? For instance, let's say I have these variables:

--primary-color: #fff;
--secondary-color: #000;

And I would like to use them in Tailwind like so:

<div class="bg-primary-color">
  <h1>Hello World</h1>
</div>

How can I achieve that?

Assuming you have already added TailwindCSS to your project and that your CSS file is called global.css.

First, you need to edit global.css to look like this:

@tailwind base;
@tailwind components;
@tailwind utilities;

.root,
#root,
#docs-root {
  --primary-color: #fff;
  --secondary-color: #000;
}

And then, in order to be able to use them, you need to update tailwind.config.js with the new CSS variables like so:

module.exports = {
  theme: {
    extend: {
      colors: {
        "primary-color": "var(--primary-color)",
        "secondary-color": "var(--secondary-color)"
      },
    },
  },
};

You can now use these variables as desired:

<div class="bg-primary-color">
  <h1>Hello World</h1>
</div>