Fix gray styling of private classes in tree.

    @include transition(background-color, 0.15s, linear);

    @include icons; }

  // Use gray for private classes

  .private .x-grid-cell-inner a {

    color: #666; }

  .private {

    .x-grid-cell-inner, .x-grid-cell-inner a {

      color: #666; } }

  .x-grid-row-over {

    .x-grid-cell-inner {

      @include transition(background-color, 0.15s, linear); } }