diff --git a/src/components/PrimaryNav/PrimaryNav.tsx b/src/components/PrimaryNav/PrimaryNav.tsx
index 0d3ce6552bf..e49323365a9 100644
--- a/src/components/PrimaryNav/PrimaryNav.tsx
+++ b/src/components/PrimaryNav/PrimaryNav.tsx
@@ -67,7 +67,7 @@ const styles: StyleRulesCallback<ClassNames> = theme => ({
   },
   fadeContainer: {
     width: '100%',
-    height: '100%',
+    height: 'calc(100% - 80px)',
     display: 'flex',
     flexDirection: 'column'
   },