  /**
   * The layout when there is only one sidebar, the left one.
   */

  .sidebar-second {
    /* Span 2 columns, starting in 1st column from right. */
    /* Span 1 column, starting in 3rd column from right. */
  }
  .sidebar-second .main-content {
    float: right;
    width: 66.66667%;
