Dcat-Admin/resources/assets/dcat/sass/components/_horizontal-menu.scss

.horizontal-menu {
  .content-wrapper, .main-footer, .main-header {
    margin-left: 0!important;
  }

  .header-navbar {
    position: -webkit-sticky;
    position: sticky;
    top: 0;
  }

  .header-navbar.navbar-horizontal,
  .main-horizontal-sidebar {
    top: 68px;
    left: 0;
    position: fixed;
    width: 100%;
    height: inherit;
    min-height: auto;
    bottom: inherit;
  }

  .nav-sidebar > .nav-item {
    padding-bottom: .6rem;

    .nav-link {
      color: $font-color;
      font-size: 1rem;
      padding: 0.4rem 1rem;
    }

    .nav-link.dropdown-toggle::after {
      margin-top: 0!important;
    }

    .nav-link.active {
      color: $primary;
      font-weight: 600;
    }
  }
  .nav.nav-pills {
    margin-bottom: 0;
  }

  .nav.dropdown-menu {
    display: none;
    margin-top: -.2rem;
    min-width: 200px;
  }

  .open > .nav.dropdown-menu {
    display: block;
    -webkit-animation: .8s cubic-bezier(.25,.8,.25,1) 0s normal forwards 1 fadein;
    animation: .8s cubic-bezier(.25,.8,.25,1) 0s normal forwards 1 fadein;
  }

  [class*=sidebar-light-] .nav-sidebar > .nav-item > .nav-treeview {
    background: #fff;
    border-radius: .4rem;
  }
}

@media (min-width: 576px) {
  .navbar-expand-sm {
    -webkit-flex-flow: row nowrap;
    -ms-flex-flow: row nowrap;
    flex-flow: row nowrap;
    -webkit-box-pack: start;
    -webkit-justify-content: flex-start;
    -ms-flex-pack: start;
    justify-content: flex-start;
  }
  .navbar-expand-sm, .navbar-expand-sm .navbar-nav {
    -webkit-box-orient: horizontal;
    -webkit-box-direction: normal;
  }
}