<div class="jumbotron">
        <div class="container"><h1>QUIENES SOMOS</h1></div>
        <img src="img3/imgHeadAcercaDe.jpg">
      </div>

/*JUMBOTRON*/

.jumbotron {
background-color: transparent;
position: relative;
padding-top: 0;
padding-bottom: 0;
}

.jumbotron img {
width: 100%;
}

.jumbotron h1{
position: absolute;
bottom: 25%;
color: #FFF;
text-shadow: 3px 3px 1px #18367c;
font-size: 40px;
font-weight: 400;
}