Printing page to PDF via browser on Confluence Cloud outputs PDF with a grey box

Issue Summary

When printing a page to PDF in Confluence Cloud via the browser-native print function (e.g. CMD+P or CTRL+P) the outputted PDF shows a grey box surrounding the entire document, making it harder to read the content.

This is reproducible on Data Center: (yes) / (no)

Steps to Reproduce

1. Navigate to a page in Confluence Cloud
2. Print the page to PDF via browser-native print (CMD+P / CTRL+P)
3. Check the output PDF

Expected Results

The page would be printed to PDF normally.

Actual Results

The page is indeed printed to PDF, however, it shows a "grey box" around the entire document.

Workaround

Collapse the sidebar before printing, and the PDF will be generated without issues.