diff --git a/website/src/components/HeadCommon.astro b/website/src/components/HeadCommon.astro
index 24388a20..9e81b0b8 100644
--- a/website/src/components/HeadCommon.astro
+++ b/website/src/components/HeadCommon.astro
@@ -78,7 +78,7 @@ const base = BASE_URL;
   // https://medium.com/quick-code/100vh-problem-with-ios-safari-92ab23c852a8
   const appHeight = () => {
     const doc = document.documentElement;
-    doc.style.setProperty('--app-height', `${window.innerHeight}px`);
+    doc.style.setProperty('--app-height', `${window.innerHeight - 1}px`);
   };
   if (typeof window !== 'undefined') {
     window.addEventListener('resize', appHeight);