html - unable to align div in center in Bootstrap v3.1.1 -

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am using bootstrap v3.1.1 , try align div center unable align div center

this page code need in center of page unable can 1 me algin form in center

<!doctype html> <html lang="en">     <head>         <title>animus blogging category flat bootstarp resposive website template | home :: w3layouts</title>         <link href="css/bootstrap.css" rel="stylesheet" type="text/css" media="all">         <link href="css/style.css" rel="stylesheet" type="text/css" media="all" />         <meta name="viewport" content="width=device-width, initial-scale=1">         <meta http-equiv="content-type" content="text/html; charset=utf-8" />         <meta name="keywords" content="graphic responsive web template, bootstrap web templates, flat web templates, andriod compatible web template,                smartphone compatible web template, free webdesigns nokia, samsung, lg, sonyerricsson, motorola web design" />     </head>     <body>         <div class="contact-top">             <div class="container">                 <h2>log in</h2>                      <div class="contact">                     <p></p>                     <div class="contact-down">                         <div class="col-md-6 contact-info" style="margin-left:auto;margin-right:auto;">                             <form>                                 <input type="text" name="your name" placeholder="user name" class="input"><br><br>                                 <input type="password" name="your email" placeholder="password" class="input">                                 <div class="clearfix"> </div>                                 <input type="submit"value="send" />                             </form>                                          </div>                         <div class="clearfix"> </div>                      </div>                 </div>               </div>         </div>     </body> </html>

can add col-md-offset-3 contact-info div follows

<div class="col-md-6 col-md-offset-3 contact-info">   <form>     <input type="text" name="your name" placeholder="user name" class="input"><br><br>     <input type="password" name="your email" placeholder="password" class="input">     <div class="clearfix"> </div>    <input type="submit"value="send" />   </form>                  </div>

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