Change menu background colour

[itmonitor]

Hello,

I am using Larry to create my own skin. The menu background colour is blue https://www.diigo.com/item/image/5pj5q/rd3m. How can I change this colour so it will not revert back to blue after a RC upgrade?

[SKaero]

If you extend the Larry skin and only change the colors in the extend theme the changes wont be overwritten when you upgrade.

[itmonitor]

Thank you. Please, which file and where in its code I can change the colour from blue to another one?