How to add new style?

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style
ask
askbot-0.11.x

Current status

I cloned from 0.11.x branch and i developed it

I change header variable color in lib_style.less file in /home/**/Documents/Askbot/askbot-devel/askbot/media/style

and i ran python manger.py collectstatic comand

But still header color is original color (#16160f)

How to fix it?