set elevation to footer

src/app/components/shared/footer/footer.component.html

 <div>
-  <mat-toolbar id="footer-toolbar">
+  <mat-toolbar id="footer-toolbar" class="mat-elevation-z24">
     <button class="focus_button" mat-button (click)="showHelp()" *ngIf="router.url !== '/home'"
             aria-labelledby="help-label">
       <mat-icon>help</mat-icon>

src/app/components/shared/header/header.component.html

-<mat-toolbar class="mat-elevation-z1">
+<mat-toolbar class="mat-elevation-z16">
   <mat-toolbar-row>
     <button id="back-button" mat-icon-button aria-labelledby="back-label" *ngIf="router.url !== '/home'" (click)="goBack()"
             matTooltip="{{'header.back' | translate}}">