ngx-admin/src/app/@theme/layouts/three-columns/three-columns.layout.scss

@import '../../styles/themes';

@include nb-install-component() {

  nb-layout-column.small {
    flex: 0.15 !important;
  }

  nb-sidebar.menu-sidebar {

    margin-top: nb-theme(sidebar-header-gap);

    /deep/ .main-container {
      height:
        calc(#{nb-theme(sidebar-height)} - #{nb-theme(header-height)} - #{nb-theme(sidebar-header-gap)}) !important;
      border-top-right-radius: nb-theme(radius);
    }

    /deep/ nb-sidebar-header {
      padding-bottom: 0.5rem;
      text-align: center;
    }

    background: transparent;

    .main-btn {
      padding: 0.75rem 2.5rem;
      margin-top: -2rem;
      font-weight: bold;
      transition: padding 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.48);

      i {
        font-size: 2rem;
        text-shadow: 0 1px 1px rgba(0, 0, 0, 0.2);
      }
      span {
        padding-left: 0.25rem;
      }

      i, span {
        vertical-align: middle;
      }
    }

    &.compacted {

      /deep/ nb-sidebar-header {
        padding-left: 0;
        padding-right: 0;
      }

      .main-btn {
        width: 46px;
        height: 44px;
        padding: 0;
        border-radius: 5px;
        transition: none;

        span {
          display: none;
        }
      }
    }
  }
}