diff --git a/prismarine-viewer/viewer/lib/ui/newStats.ts b/prismarine-viewer/viewer/lib/ui/newStats.ts
index 4f4b5cee7..6fccac533 100644
--- a/prismarine-viewer/viewer/lib/ui/newStats.ts
+++ b/prismarine-viewer/viewer/lib/ui/newStats.ts
@@ -6,7 +6,6 @@ const stats = {}
 let lastY = 20
 export const addNewStat = (id: string, width = 80, x = rightOffset, y = lastY) => {
   const pane = document.createElement('div')
-  pane.id = 'fps-counter'
   pane.style.position = 'fixed'
   pane.style.top = `${y}px`
   pane.style.right = `${x}px`
@@ -27,6 +26,7 @@ export const addNewStat = (id: string, width = 80, x = rightOffset, y = lastY) =
 
   return {
     updateText (text: string) {
+      if (pane.innerText === text) return
       pane.innerText = text
     },
     setVisibility (visible: boolean) {
diff --git a/src/react/DebugEdges.tsx b/src/react/DebugEdges.tsx
new file mode 100644
index 000000000..a65b9f92f
--- /dev/null
+++ b/src/react/DebugEdges.tsx
@@ -0,0 +1,55 @@
+import { useState } from 'react'
+import { useIsHashActive } from './simpleHooks'
+
+export default () => {
+  const MODES_COUNT = 4
+  const [mode, setMode] = useState(0)
+  const isHashActive = useIsHashActive('#edges')
+
+  if (!isHashActive) return null
+
+  const styles: React.CSSProperties = {
+    display: 'flex',
+    fontSize: 18,
+    zIndex: 10_000,
+    background: 'rgba(0, 0, 255, 0.5)',
+    border: '2px solid red',
+    whiteSpace: 'pre',
+  }
+  let text = ''
+  if (mode === 0) {
+    styles.position = 'fixed'
+    styles.inset = 0
+    styles.height = '100%'
+    text = 'inset 0 fixed 100% height'
+  }
+  if (mode === 1) {
+    styles.position = 'fixed'
+    styles.inset = 0
+    text = 'inset 0 fixed'
+  }
+  if (mode === 2) {
+    styles.position = 'absolute'
+    styles.inset = 0
+    text = 'inset 0 absolute'
+  }
+  if (mode === 3) {
+    styles.position = 'fixed'
+    styles.top = 0
+    styles.left = 0
+    styles.right = 0
+    styles.height = '100dvh'
+    text = 'top 0 fixed 100dvh'
+  }
+
+  return <div
+    style={styles}
+    onClick={() => {
+      setMode((mode + 1) % MODES_COUNT)
+    }}
+  >
+    {mode}: {text}{'\n'}
+    inner: {window.innerWidth}x{window.innerHeight}{'\n'}
+    outer: {window.outerWidth}x{window.outerHeight}{'\n'}
+  </div>
+}
diff --git a/src/react/TouchControls.tsx b/src/react/TouchControls.tsx
index b49d57c4f..1b97ffd87 100644
--- a/src/react/TouchControls.tsx
+++ b/src/react/TouchControls.tsx
@@ -57,8 +57,8 @@ export default () => {
       style={{ zIndex: modals.length ? 7 : 8 }}
       className={css`
         position: fixed;
-        inset: 0;
-        height: 100%;
+        bottom: 0;
+        /* height: 100%; */
         display: flex;
         width: 100%;
         justify-content: space-between;
diff --git a/src/react/simpleHooks.ts b/src/react/simpleHooks.ts
index da8dd9e0e..ec9c88e11 100644
--- a/src/react/simpleHooks.ts
+++ b/src/react/simpleHooks.ts
@@ -1,4 +1,5 @@
 import { useUtilsEffect } from '@zardoy/react-util'
+import { useEffect, useState } from 'react'
 import { useMedia } from 'react-use'
 
 const SMALL_SCREEN_MEDIA = '@media (max-width: 440px)'
@@ -25,3 +26,19 @@ export const useCopyKeybinding = (getCopyText: () => string | undefined) => {
     }, { signal })
   }, [getCopyText])
 }
+
+export const useIsHashActive = (hash: `#${string}`) => {
+  const [isActive, setIsActive] = useState(false)
+
+  useEffect(() => {
+    const checkHash = () => {
+      setIsActive(location.hash === hash)
+    }
+    checkHash()
+    addEventListener('hashchange', checkHash)
+    return () => {
+      removeEventListener('hashchange', checkHash)
+    }
+  }, [])
+  return isActive
+}
diff --git a/src/reactUi.tsx b/src/reactUi.tsx
index f0144d140..b432c58d0 100644
--- a/src/reactUi.tsx
+++ b/src/reactUi.tsx
@@ -45,6 +45,7 @@ import SignInMessageProvider from './react/SignInMessageProvider'
 import BookProvider from './react/BookProvider'
 import { options } from './optionsStorage'
 import BossBarOverlayProvider from './react/BossBarOverlayProvider'
+import DebugEdges from './react/DebugEdges'
 
 const RobustPortal = ({ children, to }) => {
   return createPortal(<PerComponentErrorBoundary>{children}</PerComponentErrorBoundary>, to)
@@ -198,6 +199,7 @@ const App = () => {
           <GamepadUiCursor />
         </div>
         <div />
+        <DebugEdges />
       </RobustPortal>
     </ButtonAppProvider>
   </div>