src/vs/workbench/contrib/notebook/browser/viewParts/notebookEditorToolbar.ts/NotebookEditorToolbar/_buildBody
class NotebookEditorToolbar:	private _buildBody() {
		this._notebookTopLeftToolbarContainer = document.createElement('div');
		this._notebookTopLeftToolbarContainer.classList.add('notebook-toolbar-left');
		this._leftToolbarScrollable = new DomScrollableElement(this._notebookTopLeftToolbarContainer, {
			vertical: ScrollbarVisibility.Hidden,
			horizontal: ScrollbarVisibility.Auto,
			horizontalScrollbarSize: 3,
			useShadows: false,
			scrollYToX: true
		});
		this._register(this._leftToolbarScrollable);

		DOM.append(this.domNode, this._leftToolbarScrollable.getDomNode());
		this._notebookTopRightToolbarContainer = document.createElement('div');
		this._notebookTopRightToolbarContainer.classList.add('notebook-toolbar-right');
		DOM.append(this.domNode, this._notebookTopRightToolbarContainer);
	}