XF 1.4 Navagation bar, Width...

Admin CP -> Appearance -> Templates -> EXTRA.css

Use this CSS:

Code:
#navigation
{
	position: fixed;
	top: 0px;
	left: 0px;
	
	width: 100%;
	
	margin: 0px 0px;
	padding: 0px 0px;
}

Additional styling will likely be needed to get it working how you want.
 
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