Styles not loading properly.

[Jaydiah-dev]

Hello,

I'm trying to run tailwind(4.2.1) in a newly installed rails 8 app and the styles aren't rendering properly. I'm running it via the docker devcontainer that comes preinstalled with rails and it looks like some styles are applied while others aren't.

I have tried the following:

• the puma plugin option
• using the [always] flag with the css watch command, using foreman.
• added tty:true to the docker-compose config.
• added config.assets.debug = true to the development.rb file.

I generated the rails app with rails new myapp --skip-test --force --database=postgresql --devcontainer --css tailwind.

Below is a screenshot of a page in the app. When I try the same styles on the tailwind css playground, it renders correctly.

Any suggestions on what could be wrong?

Gem versions:

rails: 8.0.2
ruby: 3.3.0
tailwindcss-rails: 4.2.1
tailwindcss-ruby: 4.0.17

Thanks.

---

local

---

tailwind payground

[rullopat]

I probably have a similar problem, I run the app locally and Tailwind works fine, but when I deploy in production with Kamal the Tailwind classes seems to be missing (for example w-20 doesn't work).

[flavorjones]

@Jaydiah-dev Sorry you're having a problem. Help me reproduce what you're seeing, please.

[Jaydiah-dev]

@flavorjones this is all of the steps I took:

• started a new rails app with the command: rails new myapp --skip-test --force --database=postgresql --devcontainer --css tailwind
• created a controller and a view.
• added html markup to the page with tailwind classes.
• reloaded the view and styles didn't render properly (as shown in the screenshot above).
• tried the markup on the tailwind playground to confirm the markup was correct...which it is from the screenshot.
• went through the docs, tried the steps I listed in the description, and none worked.

Since creating this issue, I noticed that after running rake assets:precompile and restarting the server, the page renders correctly. When I update the page markup, the new styles aren't rendered properly on the page.

The only detail missing is that I'm on an ARM Mac.

[flavorjones]

@Jaydiah-dev This is not sufficient to reproduce what you're seeing. This repo contains a test script, https://github.com/rails/tailwindcss-rails/blob/main/test/integration/user_install_test.sh, which does essentially what you've described and does not reproduce this issue.

Please let me know if that script reproduces on your machine -- in which case the root cause is likely to be the tailwind executable itself, which has had issues on ARM hardware.

If that script does not reproduce the issue on your machine, then perhaps it's a good starting point for you to provide an executable reproduction for me.

[Jaydiah-dev]

@flavorjones Running the test on my machine ends with the output below:

≈ tailwindcss v4.1.4

Done in 53ms

[54.08ms] [@tailwindcss/cli] (initial build)
[23.32ms]   ↳ Setup compiler
[10.29ms]   ↳ Scan for candidates
[ 8.88ms]   ↳ Build CSS
[ 3.68ms]   ↳ Optimize CSS
[ 4.48ms]   ↳ Write output

+ grep -q py-2 app/assets/builds/tailwind.css
+ grep -q '#abc12399' app/assets/builds/tailwind.css
+ echo OK
OK

So I'm guessing its the "executable + ARM" issue?

[flavorjones]

@Jaydiah-dev Let's keep digging. That script creates a directory, ./My Workspace/test-app, which is the generated rails app used in the tests. My advice would be to use that script (or the app) to do some debugging.

Either modify the script, or modify the app generated by the script, to more closely resemble your application -- with the exact markdown and tailwind classes if necessary. At some point, you'll take a step that introduces the issue, and then we'll know more.

[Jaydiah-dev]

@flavorjones I'll do that and share updates. Thanks

[Jaydiah-dev]

@flavorjones so I set a homepage with the app in ./My Workspace/test-install directory generated by the script, added the same markdown and it worked fine (running the app with bin/dev). I generated some other random markup with an AI tool, replaced it, and it worked fine.

I compared the gem versions in the test app and mine, and updated mine to match that of the test app:

previously

gem "tailwindcss-rails"

updated to

gem "tailwindcss-rails", "~> 4.2"
gem "tailwindcss-ruby", "~> 4.1"

I deleted my Gemfile.lock and ran bundle again. Tried running my app again (with bin/dev) and the css styles don't render properly.

This is a diff of the Gemfile.lock for the test app and mine, respectively (I've omitted other gems):

PATH
  remote: ../..
  specs:
    tailwindcss-rails (4.2.2)
    railties (>= 7.0.0)
    tailwindcss-ruby (~> 4.0)

tailwindcss-ruby (4.1.4)
tailwindcss-ruby (4.1.4-aarch64-linux-gnu)
tailwindcss-ruby (4.1.4-aarch64-linux-musl)
tailwindcss-ruby (4.1.4-arm64-darwin)
tailwindcss-ruby (4.1.4-x86_64-darwin)
tailwindcss-ruby (4.1.4-x86_64-linux-gnu)
tailwindcss-ruby (4.1.4-x86_64-linux-musl)

tailwindcss-rails (~> 4.2)!
tailwindcss-ruby (~> 4.1)

Mine

GEM
  remote: https://rubygems.org/
  specs:
    tailwindcss-rails (4.2.2)
    railties (>= 7.0.0)
    tailwindcss-ruby (~> 4.0)

tailwindcss-ruby (4.1.4)
tailwindcss-ruby (4.1.4-aarch64-linux-gnu)
tailwindcss-ruby (4.1.4-aarch64-linux-musl)
tailwindcss-ruby (4.1.4-arm64-darwin)
tailwindcss-ruby (4.1.4-x86_64-darwin)
tailwindcss-ruby (4.1.4-x86_64-linux-gnu)
tailwindcss-ruby (4.1.4-x86_64-linux-musl)

tailwindcss-rails (~> 4.2)
tailwindcss-ruby (~> 4.1)

I should reiterate that I haven't made any other changes to the app. It's a fresh install.

Hope this helps narrow things down. Thanks.

[flavorjones]

@Jaydiah-dev Thanks for doing that and sharing the results. Unfortunately I still don't understand, there doesn't appear to be any difference between the lockfiles you noted above? Am I missing something?

Question: are you removing the generated app/assets/builds/tailwind.css file in between runs?

Question: what other differences are there between your production app (which tailwind is failing on) and the test app (which tailwind is running fine on)? Can you enumerate them and either add to the test app or remove from the production app until you see the behavior change?

I think I could be more helpful if you were able to share a working reproduction. Are you able to do that?

[Jaydiah-dev]

@flavorjones I don't make changes to any build file between runs.

I just created a new rails app and pushed it here. Same issue.

The steps I took include:

• rails new tailwind-test --skip-test --force --database=postgresql --devcontainer --css tailwind
• rails db:prepare
• rails g controller public index
• added dummy markup to the page and this is what it looks like:

• ran rake assets:precompile
• restarted the server, and this is what it looks like

• updated the page with new random markup and this is what it looks like

Thanks.

[flavorjones]

@Jaydiah-dev Saying "updated the page with new random markup" does not help me reproduce what you're seeing. Please help me reproduce what you are seeing by giving me the exact markup that is causing this issue!

[Jaydiah-dev]

@flavorjones the markup can be found in the app/views/public/index.html.erb file in the repo I linked in my last response.
I used the term "random markup" because, regardless of the markup I put on the page, it is never rendered correctly.

[flavorjones]

@Jaydiah-dev Your repo renders fine for me, and does not contain the string "What would you like to compare" from your final screenshot. I cannot reproduce what you are seeing without more information. If you can't help me reproduce, I'm going to close this ticket.

[Jaydiah-dev]

@flavorjones here's another markup and what it renders as on my machine:

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[flavorjones]

And what is it supposed to look like when it renders?