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  <title>JS Bin</title>
  <style>
    ul li {
      list-style: none;
      font-size: 1.2em;
      text-shadow: 0px 0px 4px #fff;
      font-weight: bold;
      font-family: sans-serif;
    }

    .indicator{
    background-image: url(http://lorempixel.com/100/100/sports/1/);
    background-repeat: repeat-y;
    background-size: 100% 100%;
    background-position-x: left;
    background-clip: border-box;
    /*background-color: rgba(0,0,0,0.1);*/
}
    <style>
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<li class="ayah" data-key="311"><span class="indicator" style="background-size: 20%;">Some Text her and it should has dynamic background sized.</span>&nbsp;<a class="btn btn-warning" href="/verses/view/311">18</a></li>
    </ul>
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