CSS - Css, Php, Contented Shifted.

Hi,

I'm relatively new to CSS. I'm designing a site, using some .php pages. My problem: the .php pages display slightly differently than the .html pages, even though they use virtually the same CSS.

for example, i have bio.html and landscape.php.
you can find these at (URL address blocked: See forum rules)/landscape.php and (URL address blocked: See forum rules)/bio/bio.html

if you look closely, the .html pages displays its content slightly to the right of the .php content. put another way, the .php content is displayed slightly to the left of the .html content. I can't figure out how the html and php pages will display exactly the same!

landscape.php uses 3 CSS files: header.css, landscape.css, footer.css
bio.html uses: header.css, bio.css, footer.css

Has anyone seen .php pages displayed differently (or shifted horizontally) compared to .html pages?

Thanks in advance! - tim