diff --git a/apps/web/src/components/navigation/header/header.tsx b/apps/web/src/components/navigation/header/header.tsx
index cde3909667..b0c8bc2656 100644
--- a/apps/web/src/components/navigation/header/header.tsx
+++ b/apps/web/src/components/navigation/header/header.tsx
@@ -60,7 +60,7 @@ export function Header() {
               mobileMenuOpen ? '' : 'hidden'
             )}
           >
-            <Menu />
+            <Menu isMobile={mobileMenuOpen} />
           </div>
           <div className="hidden h-0 basis-full md:block lg:hidden" />
           {renderQuickbar()}
diff --git a/apps/web/src/components/navigation/header/menu/menu.tsx b/apps/web/src/components/navigation/header/menu/menu.tsx
index 6998933092..7e7ba648cf 100644
--- a/apps/web/src/components/navigation/header/menu/menu.tsx
+++ b/apps/web/src/components/navigation/header/menu/menu.tsx
@@ -12,7 +12,7 @@ const AuthItems = dynamic(() =>
   import('./auth-items').then((mod) => mod.AuthItems)
 )
 
-export function Menu() {
+export function Menu({ isMobile }: { isMobile?: boolean }) {
   const auth = useAuthentication()
   const { headerData } = useInstanceData()
   const [mounted, setMounted] = useState(false)
@@ -22,7 +22,7 @@ export function Menu() {
   const showAuth = auth && mounted
 
   return (
-    <Root>
+    <Root orientation={isMobile ? 'vertical' : 'horizontal'}>
       <List
         className={cn(
           'relative m-0 block p-0 sm:min-w-[27rem] md:text-right',
diff --git a/e2e-tests/tests/000-general.mobile.ts b/e2e-tests/tests/000-general.mobile.ts
new file mode 100644
index 0000000000..b3c6b692e2
--- /dev/null
+++ b/e2e-tests/tests/000-general.mobile.ts
@@ -0,0 +1,184 @@
+import assert from 'assert'
+
+Feature('General (mobile screen size)')
+
+// most tests duplicated from 000-general.ts
+
+Before(({ I }) => {
+  // once would be enough but this way we don't care about the order the tests are run in
+  I.resizeWindow(415, 800)
+})
+After(({ I }) => {
+  // back to default
+  I.resizeWindow(1280, 720)
+})
+
+Scenario('About Serlo @mobile', ({ I }) => {
+  I.amOnPage('/')
+
+  // Make sure it's the landing page
+  I.see('einfache Erklärungen')
+  I.see('Biologie')
+  I.see('werbefrei')
+
+  // Rounded corners are probably causing problems, move cursor a bit
+  I.click('Mehr über uns', null, { position: { x: 10, y: 10 } })
+
+  // Try to reduce flakyness
+  I.waitForText('Über Serlo', 10, 'h1')
+
+  // I am on the about page
+  I.seeInTitle('Über Serlo')
+  I.see('mehr als 10 Jahren')
+
+  // Navigating around
+  I.click('Pädagogisches Konzept')
+  I.click('Anleitung für die Lernplattform serlo.org')
+  I.scrollPageToBottom()
+  I.click('Community')
+
+  // Make sure it's the right page, wait longer to reduce flakiness
+  I.waitForText("Was gibt's zu tun?", 20)
+})
+
+Scenario('Main Menu @mobile', async ({ I }) => {
+  I.amOnPage('/')
+
+  // closed on load
+  I.dontSeeElement('nav[aria-label="Main"]')
+
+  // opens
+  I.click('button[aria-label="Menu"]')
+  I.seeElement('nav[aria-label="Main"]')
+  I.see('Fächer', 'nav[aria-label="Main"]')
+  I.see('Anmelden', 'nav[aria-label="Main"]')
+
+  // sub menus open
+  I.click('Mitmachen', 'nav[aria-label="Main"]')
+  I.see('Überprüfe Bearbeitungen', 'nav[aria-label="Main"]')
+  I.see('Zusammenarbeit', 'nav[aria-label="Main"]')
+
+  // and close
+  I.click('Mitmachen', 'nav[aria-label="Main"]')
+  I.dontSee('Überprüfe Bearbeitungen', 'nav[aria-label="Main"]')
+
+  // menu closes
+  I.click('button[aria-label="Menu"]')
+  I.dontSeeElement('nav[aria-label="Main"]')
+
+  // auto closes after navigation
+  I.click('button[aria-label="Menu"]')
+  I.click('Über Uns', 'nav[aria-label="Main"]')
+  I.click('Über Serlo', 'nav[aria-label="Main"]')
+  I.dontSeeElement('nav[aria-label="Main"]')
+
+  // opens on content page
+  I.amOnPage('/1555')
+  I.dontSeeElement('nav[aria-label="Main"]')
+  I.click('button[aria-label="Menu"]')
+  I.seeElement('nav[aria-label="Main"]')
+  I.see('Fächer', 'nav[aria-label="Main"]')
+  I.see('Anmelden', 'nav[aria-label="Main"]')
+})
+
+Scenario('Quickbar @mobile', ({ I }) => {
+  I.amOnPage('/')
+
+  I.say('Open quickbar')
+  I.click('$quickbar-input')
+  I.type('Vektor')
+
+  // Check dropdown
+  I.seeElement('$quickbar-combobox-overlay')
+  I.see('Kreuzprodukt')
+  I.see('Vektorbegriff')
+  I.see('Auf Serlo nach')
+
+  I.say('Assert aria attributes and navigate options using keyboard')
+  I.seeAttributesOnElements('$quickbar-combobox-overlay', { role: 'listbox' })
+  I.seeAttributesOnElements('$quickbar-input', { role: 'combobox' })
+
+  I.seeAttributesOnElements('$quickbar-option-0', { 'aria-selected': 'true' })
+  I.seeAttributesOnElements('$quickbar-option-1', { 'aria-selected': 'false' })
+  I.seeAttributesOnElements('$quickbar-option-2', { 'aria-selected': 'false' })
+
+  I.pressKey('ArrowDown')
+  I.seeAttributesOnElements('$quickbar-option-0', { 'aria-selected': 'false' })
+  I.seeAttributesOnElements('$quickbar-option-1', { 'aria-selected': 'true' })
+  I.seeAttributesOnElements('$quickbar-option-2', { 'aria-selected': 'false' })
+
+  I.pressKey('ArrowUp')
+  I.seeAttributesOnElements('$quickbar-option-0', { 'aria-selected': 'true' })
+  I.seeAttributesOnElements('$quickbar-option-1', { 'aria-selected': 'false' })
+  I.seeAttributesOnElements('$quickbar-option-2', { 'aria-selected': 'false' })
+
+  I.pressKey('Enter')
+  I.seeInTitle('Vektor')
+
+  I.say('Perform another search')
+  I.amOnPage('/')
+  I.click('$quickbar-input')
+  I.type('Aufgaben zu Urnenmodellen')
+
+  I.click('Aufgaben zu Urnenmodellen')
+  I.seeInTitle('Aufgaben zu Urnenmodellen')
+  I.see('Abiturkurs Stochastik')
+})
+
+Scenario('Share modal @mobile', ({ I }) => {
+  I.amOnPage('/1553')
+  I.click('Teilen')
+  I.see('Link kopieren')
+  I.see('Als PDF herunterladen')
+
+  // QR code
+  I.seeElement('svg[width="128"][height="128"]')
+})
+Scenario('Legal Pages @mobile', async ({ I }) => {
+  I.amOnPage('/')
+  I.click('Impressum')
+  I.see('Amtsgericht München')
+  I.see('Haftung für Inhalte')
+  I.seeInCurrentUrl('/legal')
+
+  I.amOnPage('/')
+  I.click('Datenschutz')
+  I.see('personenbezogene Daten')
+  I.see('Verarbeitung der Nutzerdaten')
+  I.see('Einwilligungen für externe Inhalte')
+  const date = await I.grabTextFrom('time')
+  assert.equal(true, date && date.length !== 0)
+  I.seeInCurrentUrl('/privacy')
+
+  I.amOnPage('/')
+  I.click('Nutzungsbedingungen und Urheberrecht')
+  I.see('Änderungsvorbehalt')
+  I.see('CC-BY-SA-Lizenz')
+
+  I.amOnPage('/hi/privacy')
+  I.see('Privacy Policy')
+  I.see('en@serlo.org')
+})
+Scenario('Consent @mobile', async ({ I }) => {
+  I.amOnPage('/')
+  I.click('Jetzt Spenden')
+
+  // Make sure that twingle is activated
+  const needConfirmation = await tryTo(() => {
+    I.see('Spendenformular laden')
+  })
+  if (needConfirmation) {
+    I.click('Spendenformular laden')
+  }
+
+  I.amOnPage('/')
+  I.click('Einwilligungen widerrufen')
+  I.see('Twingle')
+  I.click('Nicht mehr erlauben')
+  I.see('Keine Einwilligungen gespeichert')
+
+  // Go back and check
+  I.amOnPage('/')
+  I.click('Jetzt Spenden')
+  I.see('Spendenformular laden')
+})