html - Bootstrap centering responsive img in container -

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i want banner centered , logo above banner. can see both logo , banner , not centered. how can fix this?

here live version: http://codepen.io/anon/pen/waybxb

the html 

    </head>     <body>  <!--      ==============================          logo header     ==============================     --> <section>       <div class="container">     <div class="row">           <div class="col-md-6"><img src="http://gvsfoundation.org/wp-content/uploads/2013/04/your-logo-here-27.png" class="logo"></div>           <div class="col-md-6"></div>         </div>   </div>     </section>  <!--==============================          sliding banneer     ==============================--> <section class="banner ">       <div class="container midtext">     <div class="col-md-12 text-center hidden-xs"><img src="http://oi58.tinypic.com/eb61xd.jpg" class="img-responsive"></div>   </div>     </section>  <!--==============================          menu bar     ==============================--> <section> <div class="container"> <div class="col-md-12">       <nav>     <ul>           <li><a href="?p=home">home</a></li>           <li><a href="?p=home">codepen.io</a></li>           <li><a href="?p=home">a longer button</a></li>           <li><a href="?p=home">this long button</a></li>           <li><a href="?p=home">about us</a></li>           <li><a href="?p=home">contact</a></li>         </ul>   </nav>     </div> </section>  <!--==============================          main content     ==============================--> <section>    <div class="container"  id="mainpage">     <div class="row">       <div class="col-md-9 maincontent"><h3>codepen ---- coding has never been easy!</h3><br> notice how white centered image , logo not. how fix this?   </div>           <div class="col-md-2">i in banner section </div>         </div>   </div>     </section> </body> </html>  <!-- latest compiled , minified css --> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">  <!-- optional theme --> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">  <!-- latest compiled , minified javascript --> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>

the css

body {     background-image: url(http://oi60.tinypic.com/2hhnpzn.jpg); } nav ul {     list-style: none;      overflow: hidden;     height: 47px; } nav ul li {     color: #f9f7f7;     background-image: linear-gradient(to top, #ff6351, #ffcc6e);     padding: 8px 22px 8px 22px;     display: block;     text-align: center;     font-size: 22px;     float: left;     margin-right: 5px;     color: rgb(255, 255, 255);     background-color: rgb(120, 120, 120);     text-shadow: rgb(79, 79, 79) 1px 1px 3px; } .logo {     margin: 15px; } #mainpage { background-color: white;     } .midtext { text-align:center }  .maincontent {   margin: 33px; }

this bring banner image center of page. have add infront of image.

<section class="banner ">       <div class="container midtext">     <div class="col-md-12 text-center hidden-xs"> <center> <img src="http://oi58.tinypic.com/eb61xd.jpg" class="img-responsive"> </center></div>   </div>     </section>

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