-shadow to add back right border */
    div.tabs-container > div.tab.active.selected {
        position:relative !important; 
        z-index: 100 !important;
        outline: 1px solid var(--vscode-tab-activeBackground) !important;
        outline-offset: -1px !important;
        box-shadow: 1px 0px 0 var(--tabs-border-bottom-color);
    }
    /* make vertical sash over the tab outline */
    div.monaco-sash.vertical {
        z-index: 101 !important;
    }
    /* hide "EXPLORER" label, takes up too much r