Not able to apply bootstrap style to any component

[BAZINGAyi]

Issue type

• [ ] bug report

Issue description

Current behavior:

Expected behavior: I used ngx-admin as framework and add some new component in pages. But I can't use bootstrap style for my component.

Steps to reproduce:

For example： I find this code in boostrap4 website and copy it to my component html file. look like this:

<nav class="navbar navbar-expand-lg navbar-light bg-light">
        <a class="navbar-brand" href="#">Navbar</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse" id="navbarSupportedContent">
          <ul class="navbar-nav mr-auto">
            <li class="nav-item active">
              <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
              <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item dropdown">
              <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                Dropdown
              </a>
              <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                <a class="dropdown-item" href="#">Action</a>
                <a class="dropdown-item" href="#">Another action</a>
                <div class="dropdown-divider"></div>
                <a class="dropdown-item" href="#">Something else here</a>
              </div>
            </li>
            <li class="nav-item">
              <a class="nav-link disabled" href="#">Disabled</a>
            </li>
          </ul>
          <form class="form-inline my-2 my-lg-0">
            <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
            <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
          </form>
        </div>
      </nav>

Bootstrap website style like:

But my component style like this and click the dropdown without any effect :

What should I do，please tell me.

Related code:

Other information:

npm, node, OS, Browser

node :  v8.11.3
os: windows 10
browser: chrome

Angular, Nebular

{
  "name": "ngx-admin",
  "version": "2.3.0",
  "license": "MIT",
  "repository": {
    "type": "git",
    "url": "git+https://github.com/akveo/ngx-admin.git"
  },
  "bugs": {
    "url": "https://github.com/akveo/ngx-admin/issues"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "IE 11"
  ],
  "scripts": {
    "ng": "ng",
    "conventional-changelog": "conventional-changelog",
    "start": "ng serve --proxy-config proxy.conf.json",
    "build": "ng build",
    "build:prod": "npm run build -- --prod --aot",
    "test": "ng test",
    "test:coverage": "rimraf coverage && npm run test -- --code-coverage",
    "lint": "ng lint",
    "lint:fix": "ng lint ngx-admin-demo --fix",
    "lint:styles": "stylelint ./src/**/*.scss",
    "lint:ci": "npm run lint && npm run lint:styles",
    "pree2e": "webdriver-manager update --standalone false --gecko false",
    "e2e": "ng e2e",
    "docs": "compodoc -p src/tsconfig.app.json -d docs",
    "docs:serve": "compodoc -p src/tsconfig.app.json -d docs -s",
    "prepush": "npm run lint:ci",
    "release:changelog": "npm run conventional-changelog -- -p angular -i CHANGELOG.md -s"
  },
  "dependencies": {
    "@agm/core": "1.0.0-beta.2",
    "@angular/animations": "^6.0.0",
    "@angular/cdk": "^6.4.7",
    "@angular/common": "6.0.0",
    "@angular/compiler": "6.0.0",
    "@angular/core": "6.0.0",
    "@angular/forms": "6.0.0",
    "@angular/http": "6.0.0",
    "@angular/material": "file:node_modules/@angular/material",
    "@angular/platform-browser": "6.0.0",
    "@angular/platform-browser-dynamic": "6.0.0",
    "@angular/router": "6.0.0",
    "@asymmetrik/ngx-leaflet": "3.0.1",
    "@nebular/auth": "2.0.1",
    "@nebular/bootstrap": "2.0.1",
    "@nebular/security": "2.0.1",
    "@nebular/theme": "2.0.1",
    "@ng-bootstrap/ng-bootstrap": "1.0.0",
    "@swimlane/ngx-charts": "7.0.1",
    "@swimlane/ngx-datatable": "14.0.0",
    "angular-material-datepicker": "^1.0.2",
    "angular-tree-component": "7.2.0",
    "angular2-baidu-map": "4.5.0",
    "angular2-chartjs": "0.4.1",
    "angular2-toaster": "6.0.0",
    "bootstrap": "4.0.0",
    "chart.js": "2.7.1",
    "ckeditor": "4.7.3",
    "classlist.js": "1.1.20150312",
    "core-js": "2.5.1",
    "echarts": "^4.0.2",
    "font-awesome": "^4.7.0",
    "intl": "1.2.5",
    "ionicons": "2.0.1",
    "leaflet": "1.2.0",
    "nebular-icons": "1.0.9",
    "ng2-ckeditor": "1.1.13",
    "ng2-completer": "2.0.8",
    "ng2-smart-table": "1.3.5",
    "ng5-slider": "^1.1.6",
    "ngx-echarts": "2.0.1",
    "normalize.css": "6.0.0",
    "pace-js": "1.0.2",
    "primeng": "^4.3.0",
    "roboto-fontface": "0.8.0",
    "rxjs": "^6.1.0",
    "rxjs-compat": "^6.1.0",
    "socicon": "3.0.5",
    "sweetalert": "^2.1.2",
    "tinymce": "4.5.7",
    "typeface-exo": "0.0.22",
    "web-animations-js": "2.2.5",
    "zone.js": "^0.8.26"
  },
  "devDependencies": {
    "@angular/cli": "6.0.0",
    "@angular/compiler-cli": "6.0.0",
    "@angular/language-service": "6.0.0",
    "@compodoc/compodoc": "1.0.1",
    "@fortawesome/fontawesome-free": "^5.2.0",
    "@types/d3-color": "1.0.5",
    "@types/googlemaps": "3.30.4",
    "@types/jasmine": "2.5.54",
    "@types/jasminewd2": "2.0.3",
    "@types/leaflet": "1.2.3",
    "@types/node": "6.0.90",
    "codelyzer": "4.0.2",
    "conventional-changelog-cli": "1.3.4",
    "husky": "0.13.3",
    "jasmine-core": "2.6.4",
    "jasmine-spec-reporter": "4.1.1",
    "karma": "1.7.1",
    "karma-chrome-launcher": "2.1.1",
    "karma-cli": "1.0.1",
    "karma-coverage-istanbul-reporter": "1.3.0",
    "karma-jasmine": "1.1.0",
    "karma-jasmine-html-reporter": "0.2.2",
    "npm-run-all": "4.0.2",
    "protractor": "5.1.2",
    "rimraf": "2.6.1",
    "stylelint": "7.13.0",
    "ts-node": "3.2.2",
    "tslint": "5.7.0",
    "tslint-language-service": "0.9.6",
    "typescript": "2.7.2",
    "@angular-devkit/build-angular": "~0.6.0"
  }
}

[nnixaa]

Hi @BAZINGAyi, as for the styles, Nebular rewites the default bootstrap styles to conform with the test of the Nebular theme look&feel. If you don't need this behavior you may reomve the @nebular/bootstrap package. Regarding the dropdown, please take a look at @ng-bootstrap/ng-bootstrap package, which make the bootstrap work with Angular.