adding custom css

hi,
i have to make a logo gallery and i have in mind how make it, but
i need to add some custom css code for the template in blue, where add? and how can call it in a joomla article?
or is more convenient make a custom html module with its css...in this case how can i link the module with the css i'm going to make?

thank you

Hi
Try add your custom css to override.css file. And remember to enable override.css option in template settings.

Hi
Try add your custom css to override.css file. And remember to enable override.css option in template settings.

i can't find the override.css option in the template settings

Go to 'ADVANCED SETTINGS' section.

thank you konrad, i solved it....but now i have another problem.

In the override.css I adde a background at a div url('../images/style1/typography/icons/bg_logo_wrapper.jpg') no-repeat;

but in the browser i can see only the border of that image and not the gradient inside, could you help me?

Can you give me url to page with this image ?