@spalger/kibana/src/ui/public/collapsible_sidebar/collapsible_sidebar.less

Kibana is an open source (Apache Licensed), browser based analytics and search dashboard for Elasticsearch. Kibana is a snap to setup and start using. Kibana strives to be easy to get started with, while also being flexible and powerful, just like Elastic

.sidebar-container.collapsible-sidebar {
  position: relative;
  z-index: 1;

  .sidebar-collapser {
    background-color: #ecf0f1;
    height: 28px;
    position: absolute;
    top: 0;
    right: -20px;
    width: 20px;
    border: 1px solid #ecf0f1;
    border-width: 0 1px 1px 0;
    cursor: pointer;
    z-index: -1;
    border-bottom-right-radius: 4px;

    .chevron-cont{
      position: absolute;
      left: 4px;
      top: 5px;

      &:before {
        font-family: FontAwesome;
        color: #333;
        content: "\F053";
      }
    }
  }

  &.closed {
    width: 0 !important;
    border-right-width: 0;
    border-left-width: 0;

    > * {
      visibility: hidden;
    }

    .sidebar-collapser {
      visibility: visible;
      .chevron-cont:before {
        content: "\F054";
      }
    }
  }
}

@media (max-width: 992px) {
  .sidebar-container.collapsible-sidebar {
    &.closed {
      display: none;
    }
    .sidebar-collapser {
      display: none;
    }
  }
}