Can you help me how I can make the page without footer and header?

Site URL: https://www.fincaplaw.com/

Hi, I would like to create a page to introduce the business proposal page instead of PDF without a footer and header. 

It does need to be:

1. The header and footer should be alive on the website. Only the page should be shown without a footer and header. 

2. It should be able to access this page through the link.

Can you help me with how to do it? 

To hide header & footer on One Page, add to Page Settings > Advanced > Header

<style>
  header#header, footer.sections {display: none !important;}
</style>