[TYPO3] custom css styles per page

[Luka Mrovlje]

I have a html template that has <div class="foo">bar</div>. It's loaded 
with plugin.tx_automaketemplate_pi1.
Since every page has some specific two color theme - I would like to set 
a custom background-color on every page for class foo in constants and 
have those constants generate page specific inline style. I would not 
like to add a raw html content to every page. How can I do that with typo3?