Code refactoring

Author: BobsProgrammingAcademy

frontend/src/layout/Header.tsx

@@ -86,7 +86,7 @@ const Header = ({ onSidebarOpen }: Props): JSX.Element => {
             orientation='vertical'
             sx={{
               height: 32,
-              mx: 2,
+              marginX: 2,
               display: { lg: 'flex', md: 'none', xs: 'none' },
             }}
           />