How to change the color of my navigation bar

Instead of a common navigation bar i use a primefaces tool called dock. I want to change its background color, i don't want the grey that comes by default. But i am confused:

I don't know what i should do.

Should i create some .css? If so, how i pass it to the component?

Do开发者_运维问答 i need to hack the component source code in someway to achieve this?If so how can i change just what interests me without harming the component?

Could someone give me some tips how can i achieve my goal?

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For the top bar on the page link is pointing to. you need to override following classes

ui-dock-top ui-widget & ui-dock-item-top

add style background-color:somevalue to change the color