primeNG p-dropdown stretch 100%

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js@0.8.12/dist/zone.js"></script>
<script src="https://unpkg.com/zone.js@0.8.12/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="https://cdn.jsdelivr.net/lodash/4.17.4/lodash.min.js"></script>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/primeui/4.1.15/primeui-all.css">
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <my-app>
    loading...
  </my-app>
  </body>

</html>


.ui-dropdown	{
  background-color:black;
  width:100% !important;
}

### Angular Starter Plunker - Typescript

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {

    'app': './src',

    '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
    '@angular/animations': 'npm:@angular/animations/bundles/animations.umd.js',
    '@angular/platform-browser/animations': 'npm:@angular/platform-browser/bundles/platform-browser-animations.umd.js',
    '@angular/animations/browser': 'npm:@angular/animations/bundles/animations-browser.umd.js',
    

    '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',

    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.2.1/lib/typescript.js',
    'primeng':                    'https://npmcdn.com/primeng',
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    },
    'primeng': {
      defaultExtension: 'js'
    },
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, NgModule, VERSION} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {DropdownModule,SharedModule} from 'primeng/primeng';
import { FormsModule} from '@angular/forms';
import {BrowserAnimationsModule} from '@angular/platform-browser/animations'
@Component({
  selector: 'my-app',
  template: `
    <div>
      <h2>Hello {{name}}</h2>
      Edited items {{editedItems |json}}
      <br><br>
  <p-dropdown [options]="cities" [(ngModel)]="selectedCity"></p-dropdown>

    </div>
  `,
})
export class App {
  name:string;
  cities: SelectItem[];
      selectedCity: string;


  constructor() {
  this.cities = [];
        this.cities.push({label:'Select City', value:null});
        this.cities.push({label:'New York', value:{id:1, name: 'New York', code: 'NY'}});
        this.cities.push({label:'Rome', value:{id:2, name: 'Rome', code: 'RM'}});
        this.cities.push({label:'London', value:{id:3, name: 'London', code: 'LDN'}});
        this.cities.push({label:'Istanbul', value:{id:4, name: 'Istanbul', code: 'IST'}});
        this.cities.push({label:'Paris', value:{id:5, name: 'Paris', code: 'PRS'}});
  }
}
}

@NgModule({
  imports: [ BrowserModule,BrowserAnimationsModule,DropdownModule,FormsModule ],
  declarations: [ App ],
  bootstrap: [ App ]
})
export class AppModule {}