Adding code for first page on PDF Stylesheet truncates export on the right side

Summary

Adding code for first page on PDF Stylesheet truncates export on the right side.

Environment

• Confluence Cloud

Steps to Reproduce

• Go to the instance PDF Stylesheet at https://<INSTANCE>.atlassian.net/wiki/admin/flyingpdf/viewpdfstyleconfig.action
• On PDF Export Stylesheet > Edit.
• Add the following code:

  @page :first{         
  margin: 0;      
  padding: 0; 
  }    
  

• Click Save.
• Create a page.
• Add enough text to generate more than one page when exporting, for example using the Lorem Ipsum macro.
• Publish the page.
• Click the ... icon.
• Export to PDF.

Expected Results

• The first page of the document will have no margins, the other ones will be normal, with margins.

Actual Results

• The first page of the document have no margins, but the other pages are truncated on the right.

Workaround

• Removing the code from the PDF Stylesheet.