css - Bootstrap transparent navbar -

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i'm trying make navbar transparent kinda this. can't seem work. i've added rga(0,0,0,0.5) on navbar class.

i figured out. needs in future. added css override was: 

 .navbar.transparent.navbar-inverse .navbar-inner {    background: rgba(0,0,0,0.4); }

and html syntax looks like: 

<div class="navbar transparent navbar-inverse navbar-fixed-top">    <nav class="navbar-inner">    ...    </div> </div>

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