css – specifiying width for a page

I wrote this code to change width for all my wordpress pages in my header.css file.

<style type="text/css">
.page .site-content, .page .site-footer {
    max-width: 1100px !important;

However, I’m trying to set another width for one of my pages, lets say 1500px, because I’m embedding a PDF file in this page and the frame isn’t enough wide.
Is there a way to change width to a specific page?

This page:

I will appericate the help.

Source: wordpress

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