diff --git a/src/components/nav/TopNav.tsx b/src/components/nav/TopNav.tsx
index 0dd43b8..e4af618 100644
--- a/src/components/nav/TopNav.tsx
+++ b/src/components/nav/TopNav.tsx
@@ -79,7 +79,12 @@ const TopNav: React.FC = () => {
         position: 'sticky',
         top: 0,
         zIndex: theme.zIndex.appBar,
+        flexShrink: 0,
+        flexGrow: 0,
         height: { xs: 52, md: 56 },
+        minHeight: { xs: 52, md: 56 },
+        maxHeight: { xs: 52, md: 56 },
+        boxSizing: 'border-box',
         px: { xs: 1.5, sm: 2, md: 4 },
         backgroundColor: 'background.default',
         borderBottom: '1px solid',