Styles aren't generated when building a Docker image for ARM64 on a 2019 Intel MacBook Pro
Problem
What version of Tailwind CSS are you using? v4.1.3 What build tool (or framework if it abstracts the build tool) are you using? Rails 8.0.2 What version of Node.js are you using? - What browser are you using? Chrome What operating system are you using? macOS -> ARM64 Describe your issue I've prepared detailed steps you can follow. 1. I'm on a MacBook Pro 2019 (Intel): [code block] 2. Generate a new Rails 8 app with Tailwind enabled (zip attached): [code block] 3. Scaffold a resource that uses Tailwind classes: [code block] 4. Start the dev server and check that Tailwind styling is applied (https://localhost:3000/posts): [code block] <img width="843" alt="Screenshot 2025-04-16 at 11 44 38 AM" src="https://github.com/user-attachments/assets/1629ee36-58bf-45fd-80ec-0102de96e7fa" /> 5. Build and push a Docker image for ARM64: [code block] 6. On an ARM server (I use Hetzner CAX11), install Docker, then run the image: [code block] 7. Check the result at `http://<IP-ADDRESS>/posts` and notice that Tailwind styling is not applied: | Screenshot | application.css | |------------|-----------------| | <img width="843" alt="Screenshot 2025-04-16 at 11 44 53 AM" src="https://github.com/user-attachments/assets/3146703d-df20-4a24-a566-96e325df2723" /> | <img width="790" alt="Screenshot 2025-04-16 at 11 49 39 AM" src="https://github.com/user-attachments/assets/1da77e59-d900-4730-8400-2c70fe2fccec" /> | --- I'm happy to help debug this furthe
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1 Fix
Fix Tailwind CSS Styles Not Generated in Docker Image for ARM64
The issue arises because the Tailwind CSS build process may not be correctly configured for the ARM64 architecture when building the Docker image. This can lead to missing styles in the final output, especially if the build toolchain or dependencies are not compatible with ARM64 or if the CSS is not being generated during the build phase.
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- 1
Ensure Node.js is Installed
Make sure Node.js is installed in your Docker image. Tailwind CSS requires Node.js to build the styles. You can specify the Node.js version in your Dockerfile.
dockerfileFROM node:16-alpine - 2
Update Dockerfile for Tailwind CSS Build
Modify your Dockerfile to include the necessary steps to install Tailwind CSS and build the assets. Ensure you run the build command to generate the CSS.
dockerfileRUN npm install && npm run build - 3
Check Tailwind Configuration
Verify that your Tailwind CSS configuration file (tailwind.config.js) is correctly set up to scan the appropriate files for class names. This is crucial for generating the correct CSS.
javascriptmodule.exports = { content: ['./app/**/*.html.erb', './app/helpers/**/*.rb', './app/javascript/**/*.js'], theme: { extend: {}, }, plugins: [], }; - 4
Rebuild Docker Image
After making the changes, rebuild your Docker image to ensure that the new configurations are applied. Use the build command to create the image for ARM64.
bashdocker build --platform linux/arm64 -t your-image-name . - 5
Run and Test the Docker Container
Run the Docker container and check if the Tailwind CSS styles are now applied correctly. Access the application at the specified IP address.
bashdocker run -p 3000:3000 your-image-name
Validation
To confirm the fix worked, access the application at 'http://<IP-ADDRESS>/posts' and verify that Tailwind CSS styles are applied as expected. Check the browser's developer tools to ensure the application.css file is loaded correctly and contains the expected styles.
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Submitted by
Alex Chen
2450 rep