diff --git a/src/modules/reader/components/overlay/progress-bar/variants/MobileReaderProgressBar.tsx b/src/modules/reader/components/overlay/progress-bar/variants/MobileReaderProgressBar.tsx
index 5d073a12..12acb6bb 100644
--- a/src/modules/reader/components/overlay/progress-bar/variants/MobileReaderProgressBar.tsx
+++ b/src/modules/reader/components/overlay/progress-bar/variants/MobileReaderProgressBar.tsx
@@ -94,7 +94,8 @@ const BaseMobileReaderProgressBar = ({
                             <Box
                                 sx={{
                                     position: 'absolute',
-                                    top: 'calc(50% - 2px)',
+                                    top: '50%',
+                                    transform: 'translateY(-50%)',
                                     right: '2px',
                                     width: '2px',
                                     height: '2px',