Add border styling to ToC sidebar

src/lib/components/publications/Publication.svelte

@@ -170,7 +170,7 @@
   {#if $publicationColumnVisibility.toc}
     <Sidebar
       activeUrl={`#${activeAddress ?? ''}`}
-      asideClass='fixed md:sticky top-[130px] sm:top-[146px] h-[calc(100vh-130px)] sm:h-[calc(100vh-146px)] z-10 bg-primary-0 dark:bg-primary-1000 px-5 w-80 left-0 pt-4 md:!pr-16 overflow-y-auto rounded-lg border-primary-200 dark:border-primary-800'
+      asideClass='fixed md:sticky top-[130px] sm:top-[146px] h-[calc(100vh-130px)] sm:h-[calc(100vh-146px)] z-10 bg-primary-0 dark:bg-primary-1000 px-5 w-80 left-0 pt-4 md:!pr-16 overflow-y-auto border border-l-4 rounded-lg border-primary-200 dark:border-primary-800 my-4'
       activeClass='flex items-center p-2 bg-primary-50 dark:bg-primary-800 p-2 rounded-lg'
       nonActiveClass='flex items-center p-2 hover:bg-primary-50 dark:hover:bg-primary-800 p-2 rounded-lg'
     >