diff --git a/packages/web/src/javascripts/App.tsx b/packages/web/src/javascripts/App.tsx
index ea00622f2..3e8e7b92a 100644
--- a/packages/web/src/javascripts/App.tsx
+++ b/packages/web/src/javascripts/App.tsx
@@ -60,6 +60,7 @@ const startApplication: StartApplication = async function startApplication(
 
   const setupViewportHeightListeners = () => {
     if (!isDesktop) {
+      setViewportHeightWithFallback()
       window.addEventListener('orientationchange', setViewportHeightWithFallback)
       window.addEventListener('resize', setViewportHeightWithFallback)
     }
diff --git a/packages/web/src/javascripts/setViewportHeightWithFallback.tsx b/packages/web/src/javascripts/setViewportHeightWithFallback.tsx
index 5497178c1..5f6d0d6a8 100644
--- a/packages/web/src/javascripts/setViewportHeightWithFallback.tsx
+++ b/packages/web/src/javascripts/setViewportHeightWithFallback.tsx
@@ -2,15 +2,24 @@ import { log, LoggingDomain } from './Logging'
 
 export const ViewportHeightKey = '--viewport-height'
 
+export const setViewportHeightWithFallback = () => {
+  const newValue = visualViewport && visualViewport.height > 0 ? visualViewport.height : window.innerHeight
+
+  if (!newValue) {
+    setCustomViewportHeight('100', 'vh')
+    return
+  }
+
+  setCustomViewportHeight(String(newValue), 'px')
+}
+
 /**
  * @param forceTriggerResizeEvent On iPad at least, setProperty(ViewportHeightKey) does not trigger a resize event
  */
-export const setCustomViewportHeight = (height: number, suffix: 'px' | 'vh', forceTriggerResizeEvent = false) => {
-  const value = `${height}${suffix}`
+export const setCustomViewportHeight = (height: string, suffix: 'px' | 'vh', forceTriggerResizeEvent = false) => {
+  log(LoggingDomain.Viewport, `setCustomViewportHeight: ${height}`)
 
-  log(LoggingDomain.Viewport, `setCustomViewportHeight: ${value}`)
-
-  document.documentElement.style.setProperty(ViewportHeightKey, value)
+  document.documentElement.style.setProperty(ViewportHeightKey, `${height}${suffix}`)
 
   if (forceTriggerResizeEvent) {
     window.dispatchEvent(new Event('resize'))