SOLUTION for RAW HTML after deploying to Vercel

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hey i found the solution by manualy reviewing the whole entire project i made which is a very big project sometimes V0 cant load it lol, it took me 5 to 6 hours so anyway the main problem was the AI sometimes removeing (postcss.config.js) The Main Culprit, and the AI cant proccess and how to find this problem and solve it i spent allloooottt of credits i hope i get some refunds as reward lol.

1- what is postcss.config.js: Tailwind CSS doesn’t directly generate CSS on its own. It’s a PostCSS plugin. For Next.js to correctly process your Tailwind classes into actual CSS, it needs a postcss.config.js file at the root of the project. This file tells PostCSS to use tailwindcss and autoprefixer (another PostCSS plugin for adding vendor prefixes) to transform your utility classes into the final stylesheet. Without this file, the build process wouldn’t know how to interpret and compile your Tailwind directives (tailwind base, tailwind components, tailwind utilities) in globals.css, leading to no styles being applied.

2- tailwind.config.ts (content paths):While you had this file, ensuring the content array correctly listed all paths where you use Tailwind classes (including yourproject.tsx and yourproject.tsx which were explicitly added) is vital. If Tailwind doesn’t know where to look for your classes, it won’t include them in the final CSS bundle, even if PostCSS is running.

3- app/globals.css (Directives and Variables): Confirming that app/globals.css had the correct @tailwind directives and the necessary CSS variables for shadcn/ui was important. These are the entry points for Tailwind to inject its styles and for shadcn/ui to define its color palette.

4-next.config.mjs` (output: standalone and optimizeCss: false):

  • output: 'standalone' helps Next.js create a self-contained deployment, which can sometimes resolve environment-specific build issues.
  • experimental.optimizeCss: false was a precautionary measure. Sometimes, aggressive CSS optimization can interfere with how Tailwind or other PostCSS plugins generate the final CSS, especially in specific environments. Disabling it ensures a more straightforward CSS output.

In summary, the most critical missing piece was the postcss.config.js file, which is the bridge that allows Next.js to understand and compile your Tailwind CSS. The other updates ensured that Tailwind was looking in all the right places and that the CSS processing pipeline was robust for deployment.

i hope this saves your credits a littile for this Massive credit eater AI i hope they optimize the credit spending too and make the AI editing a thing not if you want to edit a part of the code it rwrite the whole code again which is 1500lines sometimes in some files.

Best Regards…

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Hey, thanks for digging into this

Are you saying you have a postcss.config.js file in v0 that’s not being included when you deploy?

Or that after sending prompts, sometimes v0 deletes the postcss.config.js file, and in that state it still works in the preview but breaks when deployed?

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so when you give a prompt to the V0 about chainging UI in the project sometimes it deletes the postcss config file and then if this file doesnt include in the project VERCEL will deploy it without it and it will only show the RAW HTML

The thing about preview is V0 uses DEVELOPMENT SERVER like (vite dev, next dev, npm run dev) that automatically compiles PostCSS, Tailwind, or other assets and that is why you dont have any problem with preview.

and then in the other side VERCEL doesnt know how to compile without postcss config file and it runs wihtout it because its not an error and then ignores the style and only shows raw html

my english is not that good so i hope you understand lemme know if you need anything esle to know
about this manner i will help.