fix: add border styling to TabsList in MDXHighlightTabs component

Author: pheralb

apps/website/src/components/docs/mdx-highlight-tabs.tsx

@@ -10,7 +10,7 @@ interface MDXCodeBlockSourceProps {
 const MDXHighlightTabs = ({ children }: MDXCodeBlockSourceProps) => {
   return (
     <Tabs defaultValue="shiki">
-      <TabsList className="w-full">
+      <TabsList className="w-full border border-neutral-200 dark:border-neutral-800">
         <TabsTrigger value="shiki">Shiki</TabsTrigger>
         <TabsTrigger value="sugar-high">Sugar High</TabsTrigger>
       </TabsList>