Edit your build styles list

workspace.json

...
build": {
  "executor": "@nrwl/web:build",
  "outputs": ["{options.outputPath}"],
  "options": {
    "outputPath": "dist/apps/my-app",
    "index": "apps/my-app/src/index.html",
    "main": "apps/my-app/src/main.tsx",
    "polyfills": "apps/my-app/src/polyfills.ts",
    "tsConfig": "apps/my-app/tsconfig.app.json",
    "assets": [
      "apps/my-app/src/favicon.ico",
      "apps/my-app/src/assets"
    ],
    "styles": [
      "apps/my-app/src/styles.css",
      "apps/my-app/src/app/tailwind.css"
    ],
    "scripts": [],
    "webpackConfig": "@nrwl/react/plugins/webpack"
  },
...