message: Finalize coding challenge tutorial
diff: <button mat-button style="height: 0; position: absolute;">
  <!-- 'absorbs' the auto-focus behavior -->
  </button>
  - <button mat-stroked-button mat-dialog-close class="close-dialog buttons" aria-label="Close Dialog" [mat-dialog-close]="solved">
  + <button mat-stroked-button mat-dialog-close class="close-dialog buttons" aria-label="Close Dialog" [mat-dialog-close]="solved" id="findItCloseButton">
  <i class="material-icons">
  close
  </i>
  <button mat-button style="height: 0; position: absolute;">
  <!-- 'absorbs' the auto-focus behavior -->
  </button>
  - <button mat-stroked-button mat-dialog-close class="close-dialog buttons" aria-label="Close Dialog" [mat-dialog-close]="solved">
  + <button mat-stroked-button mat-dialog-close class="close-dialog buttons" aria-label="Close Dialog" [mat-dialog-close]="solved" id="fixItCloseButton">
  <i class="material-icons">
  close
  </i>
  