Header Check for CSS

Hi,

I have recently used the CSS validator for an issue I experienced. The
system however told me that the CSS file is correct but my browser did not
want to apply the styles from the css file after I have confirmed that it
was loaded.

I have noticed that my php code has set a header for content type to
"text/plaintext" where is should be "text/css" that forced the browser to
ignore the content of the css file.

I just wanted to let you know that this might be an extra check from your
side?

kind regards,

Maarten