<mat-toolbar>
    <button mat-raised-button color="{{isSpecials && 'primary' || 'accent' }}" (click)="openSpecials()">Specials</button>
    <span class="toolbar-spacer"></span>
    <button mat-raised-button color="{{isLists && 'primary' || 'accent' }}" (click)="openLists()">My lists</button>
</mat-toolbar>

<br><br>