Update faq.mdx

new FAQ Q: Why is my screenshot blurry?

Author: kathayl

src/content/docs/browser-rendering/faq.mdx

@@ -82,3 +82,7 @@ For full feature access, use `npx wrangler dev --remote`.
 ### I upgraded from the Workers Free plan, but I'm still hitting the 10-minute per day limit. What should I do?
 
 If you recently upgraded to the Workers Paid plan to increase your Browser Rendering usage limits, but you're still encountering the 10-minute per day cap, try redeploying your Worker. This ensures your usage is correctly associated with your new plan.
+
+### Why is my screenshot blurry?
+
+If you’ve increased the viewport height and width, the image may turn out blurry. Try increasing the deviceScaleFactor (default is 1) to resolve.