laravel6のauthページにbootstrapが反映されない

laravel6でユーザ認証を導入するために以下のコマンドを実行しました。

$composer require laravel/ui --dev
$php artisan ui vue --auth
$npm install --no-bin-links
$npm run dev

laravelトップページから認証用ページを確認しましたが、bootstrapのレイアウトが正常に反映されておらず困っております。
laravel mixやnpmは今まで使用したことがないため理解が浅いですが、ご教授いただけると幸いです。

以下コマンド実行時の結果です。
composer require laravel/ui --dev

Using version ^1.2 for laravel/ui
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 1 install, 0 updates, 0 removals
  - Installing laravel/ui (v1.2.0): Downloading (100%)
Writing lock file
Generating optimized autoload files
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover --ansi
Discovered Package: facade/ignition
Discovered Package: fideloper/proxy
Discovered Package: laravel/tinker
Discovered Package: laravel/ui
Discovered Package: nesbot/carbon
Discovered Package: nunomaduro/collision
Package manifest generated successfully.

php artisan ui vue --auth

Vue scaffolding installed successfully.
Please run "npm install && npm run dev" to compile your fresh scaffolding.
Authentication scaffolding generated successfully.

npm install --no-bin-links

npm WARN rollback Rolling back fsevents@1.2.11 failed (this is probably harmless): ETXTBSY: text file is busy, rmdir '/var/www/node_modules/chokidar/node_modules/fsevents/node_modules'
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: fsevents@1.2.11 (node_modules/chokidar/node_modules/fsevents):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for fsevents@1.2.11: wanted {"os":"darwin","arch":"any"} (current: {"os":"linux","arch":"x64"})

added 1041 packages from 492 contributors and audited 17267 packages in 103.06s

34 packages are looking for funding
  run `npm fund` for details

found 0 vulnerabilities

npm run dev

> @ dev /var/www
> node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js

98% after emitting SizeLimitsPlugin

 DONE  Compiled successfully in 27288ms                                                                       9:34:25 AM
       Asset      Size   Chunks             Chunk Names
/css/app.css   177 KiB  /js/app  [emitted]  /js/app
  /js/app.js  1.39 MiB  /js/app  [emitted]  /js/app

package.jsonファイル
※npm run dev実行時に
sh: 1: cross-env: not found
のエラーが起きたので、以下のQAを参考に"scripts"部分を編集しました
リンク内容

{
    "private": true,
    "scripts": {
        "dev": "node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
        "development": "cross-env NODE_ENV=development node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
        "watch": "node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=development node_modules/webpack/bin/webpack.js --watch --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js",
        "watch-poll": "npm run watch -- --watch-poll",
        "hot": "node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=development webpack-dev-server --inline --hot --config=node_modules/laravel-mix/setup/webpack.config.js",
        "prod": "npm run production",
        "production": "node_modules/cross-env/dist/bin/cross-env.js NODE_ENV=production node_modules/webpack/bin/webpack.js --progress --hide-modules --config=node_modules/laravel-mix/setup/webpack.config.js"
    },
    "devDependencies": {
        "axios": "^0.19",
        "bootstrap": "^4.0.0",
        "cross-env": "^5.2.1",
        "jquery": "^3.2",
        "laravel-mix": "^5.0.1",
        "lodash": "^4.17.13",
        "popper.js": "^1.12",
        "resolve-url-loader": "^2.3.1",
        "sass": "^1.20.1",
        "sass-loader": "^8.0.0",
        "vue": "^2.5.17",
        "vue-template-compiler": "^2.6.10"
    }
}

layouts/app.phpファイルのhead部分

<!doctype html>
<html lang="{{ str_replace('_', '-', app()->getLocale()) }}">

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- CSRF Token -->
    <meta name="csrf-token" content="{{ csrf_token() }}">
    <title>{{ config('app.name', 'Laravel') }}</title>
    <!-- Scripts -->
    <script src="{{ asset('js/app.js') }}" defer></script>
    <!-- Fonts -->
    <link rel="dns-prefetch" href="//fonts.gstatic.com">
    <link href="https://fonts.googleapis.com/css?family=Nunito" rel="stylesheet">
    <!-- Styles -->
    <link href="{{ asset('css/app.css') }}" rel="stylesheet">
</head>

開発環境
ホストOS：windows10 home
laradock
dooker-toolbox
node:v13.9.0
npm:6.13.7