bstlboard-front/src/app/pages/notfound/notfound.page.html

<mat-card class="accent">
    <mat-card-header>
        <mat-card-title>404</mat-card-title>
        <mat-card-subtitle>{{'not-found' | i18n}}</mat-card-subtitle>
    </mat-card-header>
    <mat-card-content>
        <p>
            {{'not-found.text' | i18n}}
        </p>
    </mat-card-content>
</mat-card>