Angular Material-Schaltfläche ist nicht

Ich habe Schritte zum Material-Design zu folgen, aber wenn ich Button hinzufügen, bekomme ich nicht den MD-Stil.Angular Material-Schaltfläche ist nicht

<button mat-button [matMenuTriggerFor]="menu">Menu</button> 
    <mat-menu #menu="matMenu"> 
     <button mat-menu-item>Item 1</button> 
     <button mat-menu-item>Item 2</button> 
</mat-menu>

Package.json Datei

{ 
    "name": "apimap", 
    "version": "0.0.0", 
    "license": "MIT", 
    "scripts": { 
    "ng": "ng", 
    "start": "ng serve", 
    "build": "ng build", 
    "test": "ng test", 
    "lint": "ng lint", 
    "e2e": "ng e2e" 
    }, 
    "private": true, 
    "dependencies": { 
    "@angular/animations": "^5.0.2", 
    "@angular/cdk": "github:angular/cdk-builds", 
    "@angular/common": "^5.0.0", 
    "@angular/compiler": "^5.0.0", 
    "@angular/core": "^5.0.0", 
    "@angular/forms": "^5.0.0", 
    "@angular/http": "^5.0.0", 
    "@angular/material": "github:angular/material2-builds", 
    "@angular/platform-browser": "^5.0.0", 
    "@angular/platform-browser-dynamic": "^5.0.0", 
    "@angular/router": "^5.0.0", 
    "core-js": "^2.4.1", 
    "hammerjs": "^2.0.8", 
    "rxjs": "^5.5.2", 
    "zone.js": "^0.8.14" 
    }, 
    "devDependencies": { 
    "@angular/cli": "1.5.2", 
    "@angular/compiler-cli": "^5.0.0", 
    "@angular/language-service": "^5.0.0", 
    "@types/jasmine": "~2.5.53", 
    "@types/jasminewd2": "~2.0.2", 
    "@types/node": "~6.0.60", 
    "codelyzer": "~3.2.0", 
    "jasmine-core": "~2.6.2", 
    "jasmine-spec-reporter": "~4.1.0", 
    "karma": "~1.7.0", 
    "karma-chrome-launcher": "~2.1.1", 
    "karma-cli": "~1.0.1", 
    "karma-coverage-istanbul-reporter": "^1.2.1", 
    "karma-jasmine": "~1.1.0", 
    "karma-jasmine-html-reporter": "^0.2.2", 
    "protractor": "~5.1.2", 
    "ts-node": "~3.2.0", 
    "tslint": "~5.7.0", 
    "typescript": "~2.4.2" 
    } 
}

ich auch css Thema + Materialdesign in index.html Added MD-Module in app.mudule.ts, aber ich erhalte eine einfache HTML-Schaltfläche hinzugefügt haben Stil, nur das Mat-Menü-Item ist im MD-Stil.

Update: Ein Screenshot der Schaltfläche: