diff --git a/src/mantine-core/src/AppShell/HorizontalSection/HorizontalSection.styles.ts b/src/mantine-core/src/AppShell/HorizontalSection/HorizontalSection.styles.ts
index 787b32267a0..8d7b3bf65a4 100644
--- a/src/mantine-core/src/AppShell/HorizontalSection/HorizontalSection.styles.ts
+++ b/src/mantine-core/src/AppShell/HorizontalSection/HorizontalSection.styles.ts
@@ -52,6 +52,7 @@ export default createStyles(
         ...theme.fn.fontStyles(),
         ...position,
         top: position?.top || 'var(--mantine-header-height)',
+        bottom: 0,
         zIndex,
         height:
           height ||