.wy-nav-content {
    max-width: 85% !important;
}

/* Widen the entire left navigation area */
@media screen and (min-width: 1100px) {
  .wy-nav-side,
  .wy-side-scroll,
  .wy-side-nav-search,
  .wy-menu-vertical {
    width: 475px !important;       /* increase sidebar + grey highlight area */
    flex: 0 0 475px !important;
  }
  .wy-nav-content-wrap {
    margin-left: 475px !important; /* keep content aligned */
  }
}