Hi chaudhry_ahmad I'm aware over the 'overlay' stlye element which you can manipulate using CSS code (look and feel section) or javascript in the actual question. It's a case by case scenario I'm afraid. If you provide a preview link, along with a screen shot and annotate what you are trying to do that would help.

Basically, the process I do is use the inspect window in Chrome, find the item, find it's class and manipulate it that way. I'm no html programmer so I struggle on this at the best of times but it does have the desired effect and controlling what you want. However, you should always check multiple screen sizes, different platforms and browser to be sure it works as expected across the field.

Hope that helps

Thanks

Rod