fix sidebar scroll

frontend/src/questions/components/SidebarLayout.jsx

@@ -5,14 +5,14 @@ const SidebarLayout = ({ className, style, sidebar, children }) =>
     <div className={className} style={{ ...style, display: "flex", flexDirection: "row"}}>
         { React.cloneElement(
             sidebar,
-            { style: { flexShrink: 0, overflowY: 'scroll' },
-              className: 'scroll-show scroll--light scroll-show--hover'
+            { style: { flexShrink: 0 },
+              className: 'scroll-y scroll-show scroll--light scroll-show--hover'
             },
             sidebar.props.children
         )}
         { children && React.cloneElement(
             React.Children.only(children),
-            { style: { flex: 1, overflowY: 'scroll', display: 'flex', flexDirection: 'column', height: '100%' }},
+            { style: { flex: 1, overflowY: 'auto', display: 'flex', flexDirection: 'column', height: '100%' }},
             React.Children.only(children).props.children
         )}
     </div>