message: style(common): customize the deepindigo theme
  Since the notifications of the Deeporange-Indigo Theme were partly not readable, the used colors were adapted, so that the black text is better readable.
diff: @@ -27,5 +27,5 @@ $bluegrey-lightgreen-warn: mat-palette($mat-deep-orange);
  $bluegrey-lightgreen-theme: mat-dark-theme($bluegrey-lightgreen-primary, $bluegrey-lightgreen-accent, $bluegrey-lightgreen-warn);
  $deeporange-indigo-primary: mat-palette($mat-deep-orange, 700, 500, 900);
  -$deeporange-indigo-accent: mat-palette($mat-indigo, A200, A100, A400);
  +$deeporange-indigo-accent: mat-palette($mat-indigo, 900, 300, A100);
  $deeporange-indigo-theme: mat-light-theme($deeporange-indigo-primary, $deeporange-indigo-accent);
  