toktok (./1) :
<html><head><title></title><link href="content.css" rel="stylesheet" type="text/css"/></head><body>
this is not good. look at the examples. <html>, <head>, and <body> mlust not be used...
for css, the pb is relative / absolute path from the main php file. try with embed css in you html. -you can use file_get_content to include directly your CSS in the html, in a <style></style tag