Installing Angular Material on JHipster. Taken from https://stackoverflow.com/questions/42157853/jhipster-md-button-is-not-a-known-element

jh-material.md

yarn add --exact @angular/material
yarn start

Import angular material module into src/main/webapp/app/shared/shared-libs.module.ts:

import { MaterialModule } from '@angular/material';

@NgModule({
    imports: [
        MaterialModule,
        ...        ],
    exports: [
        MaterialModule,
        ...

Add a theme into src/main/webapp/content/css/vendor.css:

@import '~@angular/material/core/theming/prebuilt/deeppurple-amber.css';

Add some MD elements to src/main/webapp/app/home.component.html:

    <md-card>
        <button md-button class="mat-primary">Hello </button>
    </md-card>