message: style(Toast): adjust background color
diff: @toast-loading-icon-color: @white;
  @toast-line-height: 20px;
  @toast-border-radius: @border-radius-lg;
  -@toast-background-color: fade(@text-color, 88%);
  +@toast-background-color: fade(@black, 70%);
  @toast-icon-size: 40px;
  @toast-text-min-width: 96px;
  @toast-text-padding: @padding-xs @padding-sm;
  