@davidvm I was not able to get rid of the vertical scroll bar unless I went to almost 12000 pixels tall. However this broke the internal navigation on the PDF so I was not able to use it. Instead I set the scaling to a custom level for the screen I was using.
I was able to hide the main window scroll bar with the following CSS on the page settings
html, bodyfullscreen {
overflow: hidden;
}
So then I only had the PDF embed scroll bar. Note that this page was designed to display on a specific 4k monitor with specific settings (4k at 250% scaling set to full screen) so I was able to dial it in to exactly the scaling I want to fit.