Graph overlay was expanding off the screen to the size of the prompt line (#3510)

sure this isn't really important at the moment

just limited the size of the width and gave it a shadow

![image](https://github.com/invoke-ai/InvokeAI/assets/115216705/96e2db0a-9edb-48b8-9040-56ce054b5ecf)

invokeai/frontend/web/src/features/nodes/components/NodeGraphOverlay.tsx

@@ -13,12 +13,13 @@ const NodeGraphOverlay = () => {
       as="pre"
       fontFamily="monospace"
       position="absolute"
-      top={10}
+      top={2}
       right={2}
       opacity={0.7}
       background="base.800"
       p={2}
       maxHeight={500}
+      maxWidth={500}
       overflowY="scroll"
       borderRadius="md"
     >