diff --git a/packages/controls/css/widgets-base.css b/packages/controls/css/widgets-base.css
index 0ee115b192..6a16589ddc 100644
--- a/packages/controls/css/widgets-base.css
+++ b/packages/controls/css/widgets-base.css
@@ -981,7 +981,6 @@
   flex-direction: column;
 }
 
-
 /* <DEPRECATED> */
 .widget-radio-box-horizontal, /* </DEPRECATED> */
 .jupyter-widget-radio-box-horizontal {
@@ -998,7 +997,7 @@
 
 .widget-radio-box-horizontal label,
 .jupyter-widget-radio-box-horizontal label {
-	margin: 0 calc(var(--jp-widgets-input-padding) * 2) 0 0;
+  margin: 0 calc(var(--jp-widgets-input-padding) * 2) 0 0;
 }
 
 /* <DEPRECATED> */
diff --git a/packages/controls/src/widget_selection.ts b/packages/controls/src/widget_selection.ts
index 11e7d22d1a..7986383d79 100644
--- a/packages/controls/src/widget_selection.ts
+++ b/packages/controls/src/widget_selection.ts
@@ -288,7 +288,7 @@ export class RadioButtonsModel extends SelectionModel {
       tooltips: [],
       icons: [],
       button_style: '',
-			orientation:'vertical',
+      orientation: 'vertical',
     };
   }
 }
@@ -306,24 +306,24 @@ export class RadioButtonsView extends DescriptionView {
     this.el.appendChild(this.container);
     this.container.classList.add('widget-radio-box');
 
-		this.update();
+    this.update();
   }
 
   /**
    * Update the contents of this view
    *
-	 * Called when the model is changed.  The model may have been
-	 * changed by another view or by a state update from the back-end.
+   * Called when the model is changed.  The model may have been
+   * changed by another view or by a state update from the back-end.
    */
-	update(options?: any): void {
-		if (this.model.get('orientation') === 'vertical') {
-			this.container.classList.remove('widget-radio-box-horizontal');
-			this.container.classList.add('widget-radio-box-vertical');
-		} else {
-			this.container.classList.remove('widget-radio-box-vertical');
-			this.container.classList.add('widget-radio-box-horizontal');
-		}
-		const items: string[] = this.model.get('_options_labels');
+  update(options?: any): void {
+    if (this.model.get('orientation') === 'vertical') {
+      this.container.classList.remove('widget-radio-box-horizontal');
+      this.container.classList.add('widget-radio-box-vertical');
+    } else {
+      this.container.classList.remove('widget-radio-box-vertical');
+      this.container.classList.add('widget-radio-box-horizontal');
+    }
+    const items: string[] = this.model.get('_options_labels');
     const radios = Array.from(
       this.container.querySelectorAll<HTMLInputElement>('input[type="radio"]')
     ).map((x) => x.value);