@media screen and (max-width: 1260px) and (min-width: 768px) {
  .single-post-sidebar {
    position: fixed;
    top: 22px;
    right: calc((100% - 720px) / 2 + 80px);
    z-index: 99;
    margin-right: 0;
  }
  .single-post-sidebar.opened {
    left: 0;
    right: 0;
    top: 0;
  }
}