css - Text won't display in Bootstrap Jumbotron w/ image -

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i trying add background image twitter bootstrap jumbotron class.

i using bootstrap3.

i tried alpha'd text , did not restrict image jumbotron:

      .jumbotron:after {           background: url("img/island.png") repeat scroll center center transparent;           bottom: 0;           content: "";           display: block;           left: 0;           opacity: 0.4;           position: absolute;           right: 0;           top: 0;       }

here html:

<!-- main jumbotron primary marketing message or call action --> <div class="jumbotron">   <div class="container">     <h1>hello, world!</h1>     <p>this template simple marketing or informational website.</p>     <p><a class="btn btn-primary btn-lg">learn more &raquo;</a></p>   </div> </div>

this got me 90% of way text not show:

<link href="css/bootstrap.css" rel="stylesheet">    <style type="text/css">        .jumbotron {           position: relative;           z-index: 3;       }        .jumbotron:after {           background: linear-gradient(rgba(255,255,255,0), rgba(255,255,255,1)), url('img/carousel_island.png');           bottom: 0;           content: "";           display: block;           left: 0;           position: absolute;           right: 0;           top: 0;           z-index: 2;       }   </style>

you should relatively position .jumbotron class pseudo-element relative it; if there no ancestor element positioned relatively, absolutely positioned elements relative viewport.

try adding:

.jumbotron {    position: relative; }

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