src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/_createBody
class NotebookEditorWidget:	private _createBody(parent: HTMLElement): void {
		this._notebookTopToolbarContainer = document.createElement('div');
		this._notebookTopToolbarContainer.classList.add('notebook-toolbar-container');
		this._notebookTopToolbarContainer.tabIndex = 0;
		this._notebookTopToolbarContainer.style.display = 'none';
		DOM.append(parent, this._notebookTopToolbarContainer);
		this._body = document.createElement('div');
		DOM.append(parent, this._body);

		this._body.classList.add('cell-list-container');
		this._createLayoutStyles();
		this._createCellList();

		this._notebookOverviewRulerContainer = document.createElement('div');
		this._notebookOverviewRulerContainer.classList.add('notebook-overview-ruler-container');
		this._list.scrollableElement.appendChild(this._notebookOverviewRulerContainer);
		this._registerNotebookOverviewRuler();

		this._overflowContainer = document.createElement('div');
		this._overflowContainer.classList.add('notebook-overflow-widget-container', 'monaco-editor');
		DOM.append(parent, this._overflowContainer);
	}