Using Hugo with Tailwind CSS 2

Tailwind CSS version 2 has recently been released. This blog post shows how to add Tailwind CSS to your Hugo generated blog.

Make sure you have Hugo installed to follow along. I am using Hugo 0.79.0. You also need to have npm installed. I am using 6.14.7.

Create a new Hugo site:
```
hugo new site my-hugo-site
```
my-hugo-site can be anything you want, it will also be the directory where the files are created.
Change to the generated directory and create an empty package.json file to bootstrap the npm project:
```
cd my-hugo-site
npm init
```
Enter the requested information, or just go with the defaults.

Install Tailwind CSS as an npm dependency together with the other needed dependencies:

npm install tailwindcss postcss postcss-cli autoprefixer

This should result in an update of package.json to have a dependencies section like this:

{
  ...
  "dependencies": {
    "autoprefixer": "^10.2.1",
    "postcss": "^8.2.4",
    "postcss-cli": "^8.3.1",
    "tailwindcss": "^2.0.2"
  }
}

Create postcss.config.js at the root of the project with the following contents:

module.exports = {
    plugins: {
        tailwindcss: {},
        autoprefixer: {}
    }
}

Initialize the Tailwind CSS configuration file:
```
npx tailwindcss init
```
This generates a tailwind.config.js file. This allows to configure and customize Tailwind CSS.

Update the purge option in tailwind.config.js:

module.exports = {
  purge: ['layouts/**/*.html'],
  darkMode: false, // or 'media' or 'class'
  theme: {
    extend: {},
  },
  variants: {
    extend: {},
  },
  plugins: [],
}

Create assets/css/main.css with the Tailwind CSS directives (You will need to create the assets/css directory manually):
```
@tailwind base;
@tailwind components;
@tailwind utilities;
```

Create layouts/_default/baseof.html:

<!DOCTYPE html>
<html lang="{{ .Language.Lang }}">
<head>
    {{ partial "head.html" . }}
</head>
<body>
{{ block "main" . }}{{ end }}
{{ partial "footer.html" . }}
</body>
</html>

Create layouts/partials/head.html:

<meta http-equiv="Content-Type" content="text/html" charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />

{{ $styles := resources.Get "css/main.css" | postCSS }}

{{ if .Site.IsServer }}
  <link rel="stylesheet" href="{{ $styles.RelPermalink }}"/>
{{ else }}
  {{ $styles := $styles | minify | fingerprint | resources.PostProcess }}
  <link rel="stylesheet" href="{{ $styles.RelPermalink }}" integrity="{{ $styles.Data.Integrity }}"/>
{{ end }}

The .Site.IsServer flag is true when running the live reload server. When building for production, this is false. This allows to only minify and purge the CSS when building the production site.

Create layouts/partials/footer.html:

<footer class="bg-gray-900">
    <div class="flex justify-center text-white py-1">This is the footer</div>
</footer>

Create layouts/index.html:

{{ define "main" }}
<main class="container mx-auto px-4 py-24 bg-gray-100">
    <h1>Welcome to Hugo with Tailwind CSS</h1>
    <div class="text-gray-500">This is an example site with Tailwind CSS 2</div>
</main>
{{ end }}

Start the Hugo live reload server:
```
hugo server
```

With all this in place, the browser should show something like this:

You see the website with some basic styling from the Tailwind CSS classes that have been used.

Since Tailwind CSS normalizes everything, the <h1> title will be just normal text size. We can give it a style to our liking by updating assets/css/main.css using @apply:

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

h1 {
    @apply text-5xl font-bold mt-12 mb-2
}

The browser should automatically refresh and show the updated title style:

To build for production, be sure to set the NODE_ENV variable:

NODE_ENV=production hugo

This will ensure only the minimum needed CSS will be generated.

I would like to thank the authors of How to Get Tailwind Integrated With a Hugo Site and rockylinux.org for the inspiration they provided to get to this setup.

Using Hugo with Tailwind CSS 2

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