html - Center Navbar Toggle Button (Bootstrap 3) -


i reason cannot navbar toggle button center. there multiple threads relating issue, reason can't it. direct useful!

i have following css dedicated towards button: 

          .navbar-toggle {             width: 100%;             float: none;             margin: auto;             border-width:0;             border-radius:0;             }             .navbar-header {               text-align:center;               }

and following html dedicated button when screen small: 

<div class="navbar-header">                  <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">                    <span class="sr-only"> toggle navigation </span>                   <span class="icon-bar"></span>                   <span class="icon-bar"></span>                   <span class="icon-bar"></span>                  </button>         </div>

here full code: 

<!doctype html> <html lang="en"> <head>   <title>website title</title>   <meta charset="utf-8">   <meta http-equiv="x-ua-compatible" content="ie=edge">   <meta name="viewport" content="width=device-width, initial-scale=1">   <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">   <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.0/jquery.min.js"></script>   <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>   <link href="https://fonts.googleapis.com/css?family=petit+formal+script" rel="stylesheet">    <style>        img {       display: block;       margin: 0 auto;       }        h1 {         font-family: 'lora', serif;         color:#453d51;         text-align:center;         font-size:40px;       }        .subtitle {         font-family: 'petit formal script', cursive;         font-size:60px;         text-align:center;         letter-spacing:2px;        }        .navbar-default {         background-color: white;         font-family: 'lora', serif;         font-size: 20px;         padding-left:2px;         padding-right: 2px;        }        .navbar-toggle {         width: 100%;         float: none;         margin: auto;         border-width:0;         border-radius:0;         }         .navbar-header {           text-align:center;           }    </style>  </head>   <body>      <div class="navbar navbar-default navbar-fixed-top" role="navigation">      <div class="container">          <div class=container>           <img src="c:\users\mmosl\onedrive\documents\portfolio\logo\logo.png" margin="0" href="index.html" width=25% height=25%>           <h1> portfolio </h1>           <p class=subtitle> mrs. slater </p>         </div>          <div class="navbar-header">              <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">                <span class="sr-only"> toggle navigation </span>               <span class="icon-bar"></span>               <span class="icon-bar"></span>               <span class="icon-bar"></span>              </button>     </div>   </nav>  </div> </body> </html>

i'd provide website not live. here screenshot: https://drive.google.com/open?id=0b_6fmxn_tvcros03emffemvlvek


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