diff --git a/packages/web/components/templates/reader/ReaderHeader.tsx b/packages/web/components/templates/reader/ReaderHeader.tsx
index 15819cb54..852e5ee14 100644
--- a/packages/web/components/templates/reader/ReaderHeader.tsx
+++ b/packages/web/components/templates/reader/ReaderHeader.tsx
@@ -28,7 +28,7 @@ export function ReaderHeader(props: ReaderHeaderProps): JSX.Element {
           bg: 'transparent',
           pt: '35px',
           borderBottom: '1px solid transparent',
-          '@mdDown': {
+          '@lgDown': {
             height: MOBILE_HEIGHT,
             pt: '0px',
             bg: '$grayBg',