diff --git a/.changeset/breezy-nights-repair.md b/.changeset/breezy-nights-repair.md
new file mode 100644
index 0000000000..1f4aa422c3
--- /dev/null
+++ b/.changeset/breezy-nights-repair.md
@@ -0,0 +1,5 @@
+---
+"gitbook": patch
+---
+
+Fix webframe height issue
diff --git a/packages/gitbook/e2e/internal.spec.ts b/packages/gitbook/e2e/internal.spec.ts
index 1109963382..34088e136b 100644
--- a/packages/gitbook/e2e/internal.spec.ts
+++ b/packages/gitbook/e2e/internal.spec.ts
@@ -779,7 +779,10 @@ const testCases: TestsCase[] = [
                 url: 'blocks/integrations',
                 run: async (page) => {
                     await waitForCookiesDialog(page);
-                    const mermaidIframe = page.locator('iframe[title*="mermaid"]').contentFrame();
+                    const mermaidIframe = page
+                        .locator('iframe[title*="mermaid"]')
+                        .first()
+                        .contentFrame();
                     await expect(mermaidIframe.getByText('Mermaid', { exact: true })).toBeVisible();
                     await expect(mermaidIframe.getByText('Diagram', { exact: true })).toBeVisible();
                 },
diff --git a/packages/react-contentkit/src/ElementWebframe.tsx b/packages/react-contentkit/src/ElementWebframe.tsx
index 8dfedbfa06..e0474087a6 100644
--- a/packages/react-contentkit/src/ElementWebframe.tsx
+++ b/packages/react-contentkit/src/ElementWebframe.tsx
@@ -2,13 +2,14 @@
 
 import type { ContentKitWebFrame } from '@gitbook/api';
 import React from 'react';
-import { useResizeObserver } from 'usehooks-ts';
 
 import { Icon } from '@gitbook/icons';
 import { useContentKitClientContext } from './context';
 import { resolveDynamicBinding } from './dynamic';
 import type { ContentKitClientElementProps } from './types';
 
+const MIN_HEIGHT = 32; // minimum height for the iframe in pixels
+
 export function ElementWebframe(props: ContentKitClientElementProps<ContentKitWebFrame>) {
     const { element } = props;
 
@@ -159,21 +160,22 @@ export function ElementWebframe(props: ContentKitClientElementProps<ContentKitWe
         return sendMessage({ state });
     }, [element.data, renderer.state, sendMessage]);
 
-    // @ts-expect-error type definition is wrong for useResizeObserver
-    const { width: observedWidth = 0 } = useResizeObserver({ ref: iframeRef });
-    const liveWidth = observedWidth || iframeRef.current?.clientWidth || 0;
-
-    const aspectRatio = size.aspectRatio || element.aspectRatio;
+    const height = size.height ? Math.max(size.height, MIN_HEIGHT) : undefined;
 
-    const height =
-        liveWidth && aspectRatio && liveWidth > (size.height ?? 0)
-            ? Math.min(Math.round(liveWidth / aspectRatio), size.height ?? 32)
-            : 'auto';
+    const aspectRatio =
+        size.aspectRatio ||
+        element.aspectRatio ||
+        (iframeRef.current?.clientWidth && height
+            ? iframeRef.current.clientWidth / height
+            : undefined);
 
     if (!mounted) {
         return <Icon icon="spinner" className="contentkit-button-loading" style={{ height }} />;
     }
 
+    // only use height measurement if no aspect ratio is defined
+    const useHeightMeasurement = !aspectRatio && height;
+
     return (
         <iframe
             ref={iframeRef}
@@ -181,14 +183,11 @@ export function ElementWebframe(props: ContentKitClientElementProps<ContentKitWe
             title={element.source.url}
             allowFullScreen
             allow="clipboard-write"
-            className="contentkit-webframe"
+            className="contentkit-webframe h-full w-full max-w-full border-none"
             style={{
-                width: '100%',
-                maxWidth: '100%',
                 aspectRatio,
+                height: useHeightMeasurement ? height : undefined,
                 maxHeight: height,
-                height: 'fit-content',
-                border: 'none',
             }}
         />
     );