I am not using that skin (DnnBooster skin) and I do not see anywhere in my core DNN or skin files where these are :

"Secondly add an extra class, 'controlbarfix' to the Bootstrap nav tag:

< div class="navbar-fixed-top controlbarfix" >"

or this

"If the skin is not using the fixed-top but uses a page wrapper tag, add 'controlbarfix' to the wrapper tag. that will do the same thing."

Awesome, thank you ;)

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