diffrent color for every widget’s title

Hello,
I have such problem:
I’ve placed two widgets into my sidebar: “pages” and “text” and I’d like to use grey color for “pages” title’s widget and white for title of “text” widget. Problem is that both widgets generates exactly the same class name for their titles:
pages:
‘<li id=”pages-1″ class=”widget widget_pages”><h2 class=”widgettitle”>Pages</h2>’
and text widget:
‘<li id=”text-1″ class=”widget widget_text”><h2 class=”widgettitle”>Just title</h2>’
After few hours of trying finding every possible combination of the path for my css I am bagging for help.
I am sure it can be done but how.
Thank you very much for your help in advance.
Greetings,
rumpowanysko