bring back sticky copy button

examples/server/webui/src/components/ChatScreen.tsx

@@ -70,7 +70,7 @@ export default function ChatScreen() {
     >
       <div className="flex flex-col w-full max-w-[900px] mx-auto">
         {/* chat messages */}
-        <div id="messages-list" className="flex flex-col grow overflow-y-auto">
+        <div id="messages-list" className="grow">
           <div className="mt-auto flex justify-center">
             {/* placeholder to shift the message to the bottom */}
             {viewingConversation ? '' : 'Send a message to start'}

examples/server/webui/src/components/MarkdownDisplay.tsx

@@ -77,7 +77,7 @@ const CodeBlockButtons: React.ElementType<
   return (
     <div
       className={classNames({
-        'text-right sticky top-4 mb-2 mr-2 h-0': true,
+        'text-right sticky top-[7em] mb-2 mr-2 h-0': true,
         'display-none': !node?.position,
       })}
     >
@@ -152,9 +152,7 @@ function rehypeCustomCopyButton() {
         // replace current node
         preNode.properties.visited = 'true';
         node.tagName = 'div';
-        node.properties = {
-          className: 'relative my-4',
-        };
+        node.properties = {};
         // add node for button
         const btnNode: ElementContent = {
           type: 'element',