Untitled

<link class="cssdeck" rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.5/css/bootstrap.min.css">

<div class="intro_img">

  <img class="intro img-responsive center-block" src="https://placeholdit.imgix.net/~text?txtsize=33&txt=280%C3%97120&w=280&h=120" width="280" height="120" />

</div>

.intro_img {

             text-align: center;

         }

         @media (min-width: 760px) {

             .intro {

                 margin-bottom: 5px;

             }

         }