JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<div class="row front-page-img ng-scope">
  <img class="img-responsive" src="http://www.echomountainresort.com/wp-content/uploads/2014/10/echo-mountain-concert_banner_bg.jpg" style="box-shadow: rgba(0,0,0,.2) 3px 5px 5px;">
  <div class="front-page-container-search">
    <h3>This is the text that I wish could be solid white, but instead it is transparent</h3>
    <form>
      <div class="input-group">
        <input type="text" class="form-control">
          <span class="input-group-btn">
        <button class="btn btn-default" type="submit">
          <span class="glyphicon glyphicon-search"></span>
        </button>
        </span>
      </div>
    </form>
  </div>
</div>

CSS

.front-page-img {
    margin-right: 0px;
}
.front-page-container-search{
    position:absolute;
    left: 50px;
    right:50px;
    width: 200px;
    color: white;
    text-align: center;
    top: 75px;
    background-color: rgba(0, 0, 0, 0.6);
    border: 1px solid black;
    opacity: 0.7;
    margin: 0 auto;
}