diff --git a/src/expander/Expander.spec.ts b/src/expander/Expander.spec.ts
index b76324dd..02ea7768 100644
--- a/src/expander/Expander.spec.ts
+++ b/src/expander/Expander.spec.ts
@@ -6,8 +6,7 @@ test(`Expander - Visual and Behaviour`, async ({ page }) => {
         const expander = page.locator('.Interactive').getByTestId('test-expander');
 
         await expect(expander).toHaveScreenshot('expander-initial.png');
-
-        const animantionEnd = await mockEventListener(expander, 'animationend');
+        await expect(expander).not.toHaveAttribute('expanded', '');
 
         const expanderHeader = expander.locator('.header');
         await expanderHeader.click();
@@ -17,8 +16,8 @@ test(`Expander - Visual and Behaviour`, async ({ page }) => {
         await expect(expander).toHaveScreenshot('expander-expanded.png');
 
         await expanderHeader.click();
-        await page.waitForTimeout(600);
-        await expect(animantionEnd).toBeCalledTimes(2);
+
+        await expect(expander).not.toHaveAttribute('expanded', '');
     });
 });
 
diff --git a/src/expander/Expander.stories.ts b/src/expander/Expander.stories.ts
index 9b31ba7d..73d81cce 100644
--- a/src/expander/Expander.stories.ts
+++ b/src/expander/Expander.stories.ts
@@ -196,7 +196,7 @@ import { OmniLabel } from "@capitec/omni-components-react/label";
 
 const App = () => 
 <OmniExpander${args.label ? ` label='${args.label}'` : ''}>
-    <svg slot="header-icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="100%" height="100%"><path d="m7.446 6.397.084.073L13 11.939l5.47-5.47a.75.75 0 0 1 1.133.977l-.073.084L14.061 13l5.47 5.47a.75.75 0 0 1-.977 1.133l-.084-.073L13 14.061l-5.47 5.47a.75.75 0 0 1-1.133-.977l.073-.084L11.939 13l-5.47-5.47a.75.75 0 0 1 .977-1.133Z"/></svg>
+    <svg slot="header-icon" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" width="24" height="24"><path d="m7.446 6.397.084.073L13 11.939l5.47-5.47a.75.75 0 0 1 1.133.977l-.073.084L14.061 13l5.47 5.47a.75.75 0 0 1-.977 1.133l-.084-.073L13 14.061l-5.47 5.47a.75.75 0 0 1-1.133-.977l.073-.084L11.939 13l-5.47-5.47a.75.75 0 0 1 .977-1.133Z"/></svg>
     <OmniLabel label="The content of the expander"></OmniLabel>
 </OmniExpander>;`
         }
diff --git a/src/expander/ExpanderGroup.ts b/src/expander/ExpanderGroup.ts
index fbc1877c..c4c1052a 100644
--- a/src/expander/ExpanderGroup.ts
+++ b/src/expander/ExpanderGroup.ts
@@ -22,7 +22,7 @@ import { OmniElement } from '../core/OmniElement.js';
  * ```
  *
  * @element omni-expander-group
- * 
+ *
  * @slot - Default slot to slot multiple expanders.
  *
  * @cssprop --omni-expander-group-container-min-width - Expander group min width.