My PDF file eludes me and my header

v 2.1.2
Here is the Theme I’m using.

Here is my site.

The theme allows me to put in a jpg in the CSS for the header. I did so, just while I wait for the header a friend is making me. He sent me a first version of my new header in PDF and I tried to load it (upload to images folder, drop in CSS style sheet) and it didn’t appear.

Here’s the code I put in:

#header {height: 118px; padding: 83px 0px 0px 25px;background: url(images/header_graphic_red.pdf) bottom center no-repeat;

Within those parenthesis – that’s me.

Any idea why?

(I put this post in ‘troubleshooting,’ but it insisted on installation!)