[Quote builder] print to pdf 

- Task: https://www.odoo.com/web#id=9286&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.J3mShCzM9sV03MEw
In so_quotation, you are re calling website.layout : so the menu, ... will be render too, and it's useless.
You have to refactor the so_quotation template : split it into so_quotation (a template that call website.layout, and the so_quotation content), and so_quotation_content (a template containing the content (the div with .o_website_quote class)).
Your report_quote should call so_quotation_content directly. The HTML page structure will be rendered with the report.html_container. After that, you probably have to retest the render in the pdf file, and recheck your css.
n the css.