Angular components are not receiving the Tailwind CSS attributes applied to :root classes

In my Angular 12 project, I have integrated Tailwind CSS. The structure of the package.json is as below:

{
  "name": "some-angular-app",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "watch": "ng build --watch --configuration development",
    "test": "ng test"
  },
  "private": true,
  "dependencies": {
    ...
  },
  "devDependencies": {
    ...
  }
}

I followed the installation guide for Tailwind CSS available here. My tailwind.config.js file is structured like this:

module.exports = {
  ...
};

Furthermore, I have configured my styles.css file to work with Tailwind CSS:

@import 'tailwindcss/base';
@import 'tailwindcss/components';
@import 'tailwindcss/utilities';

...

Now, I am attempting to create a header component within my app.component. While basic styling seems to be working fine, making changes in the :root class doesn't reflect in the browser as expected. Here's an example:

:root {
  @apply flex flex-row items-center content-between h-8 bg-purple max-h-8 text-pink
}

The rendered output looks different than intended. Also, applying Tailwind CSS attributes directly in the HTML template sometimes works and sometimes doesn't. For instance:

<app-header class="bg-purple"></app-header>

I'm looking for guidance on how to ensure consistent application of Tailwind CSS styles to components directly.

Answer №1

Upon revisiting the documentation on Angular, I finally caught my mistake. The correct selector for the component element is not :root, but :host.

For example, using

:host {
  @apply flex flex-row items-center content-between h-8 bg-purple max-h-8 p-4 w-full
}

works perfectly fine.

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