Update notebook output width (fixes #101663)

src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts

@@ -1563,7 +1563,7 @@ registerThemingParticipant((theme, collector) => {
 	collector.addRule(`.notebookOverlay .cell-list-container > .monaco-list > .monaco-scrollable-element > .monaco-list-rows > .markdown-cell-row { padding-bottom: ${CELL_BOTTOM_MARGIN}px; }`);
 	collector.addRule(`.notebookOverlay .cell-list-container > .monaco-list > .monaco-scrollable-element > .monaco-list-rows > .markdown-cell-row .cell-bottom-toolbar-container { margin-top: ${CELL_BOTTOM_MARGIN}px; }`);
 	collector.addRule(`.notebookOverlay .output { margin: 0px ${CELL_MARGIN}px 0px ${CODE_CELL_LEFT_MARGIN + CELL_RUN_GUTTER}px; }`);
-	collector.addRule(`.notebookOverlay .output { width: calc(100% - ${CODE_CELL_LEFT_MARGIN + CELL_RUN_GUTTER + CELL_MARGIN}px); }`);
+	collector.addRule(`.notebookOverlay .output { width: calc(100% - ${CODE_CELL_LEFT_MARGIN + CELL_RUN_GUTTER + (CELL_MARGIN * 2)}px); }`);
 	collector.addRule(`.notebookOverlay .cell-bottom-toolbar-container { width: calc(100% - ${CELL_MARGIN * 2 + CELL_RUN_GUTTER}px); margin: 0px ${CELL_MARGIN * 2}px 0px ${CELL_MARGIN + CELL_RUN_GUTTER}px; }`);
 
 	collector.addRule(`.notebookOverlay .cell-list-container > .monaco-list > .monaco-scrollable-element > .monaco-list-rows > .monaco-list-row  > div.cell.markdown { padding-left: ${CELL_RUN_GUTTER}px; }`);

src/vs/workbench/contrib/notebook/browser/view/renderers/backLayerWebView.ts

@@ -242,7 +242,7 @@ export class BackLayerWebView extends Disposable {
 
 		this.element = document.createElement('div');
 
-		this.element.style.width = `calc(100% - ${CODE_CELL_LEFT_MARGIN + CELL_MARGIN + CELL_RUN_GUTTER}px)`;
+		this.element.style.width = `calc(100% - ${CODE_CELL_LEFT_MARGIN + (CELL_MARGIN * 2) + CELL_RUN_GUTTER}px)`;
 		this.element.style.height = '1400px';
 		this.element.style.position = 'absolute';
 		this.element.style.margin = `0px 0 0px ${CODE_CELL_LEFT_MARGIN + CELL_RUN_GUTTER}px`;