fix: upgrade level with zIndex in PageContent

because of multi-avatar icon's white line with render upper to content
because of its z-index is 1

client/web/src/routes/Main/Content/PageContent.tsx

@@ -130,6 +130,7 @@ export const PageContent: React.FC<PropsWithChildren<PageContentProps>> =
             }
           )}
           data-tc-role={props['data-tc-role']}
+          style={{ zIndex: 1 }}
         >
           <div className="tc-content-background" />