Bootstrap Menu Collapse working but isn't showing icons -

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i optimizing website mobile devices. noticed collapsible menu working, doesn't show icon bars. basically, if click in area navbar icons should be, dropdown menu show.

how can make icons show visitors can know there menu.

here code menu 

<body data-spy="scroll" data-target="#topnav">    <div class="navbar navbar-color navbar-fixed-top" id="topnav">     <div class="container">        <div class="navbar-header">         <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">           <span class="icon-bar"></span>           <span class="icon-bar"></span>           <span class="icon-bar"></span>         </button>         <a class="navbar-brand page-scroll" href="#page-top">webinsight</a>       </div>        <div class="navbar-collapse collapse">         <ul class="nav navbar-nav">           <li class="active navbutton"><a href="#home">home</a></li>           <li class="navbutton"><a href="services">services</a></li>           <li class="navbutton"><a href="contact">contact</a></li>         </ul>       </div>       <!--/.navbar-collapse -->      </div>   </div>  </body>

the website hustlebussellunlimited.com if want check out mean!

add navbar-default navbar-inverse .navbar div show toggle styles. or write css style icon-bars.

default example:

.navbar.navbar-color {    background: cyan;  }
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />    <body data-spy="scroll" data-target="#topnav">      <div class="navbar navbar-default navbar-color navbar-fixed-top" id="topnav">      <div class="container">          <div class="navbar-header">          <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">            <span class="icon-bar"></span>            <span class="icon-bar"></span>            <span class="icon-bar"></span>          </button>          <a class="navbar-brand page-scroll" href="#page-top">webinsight</a>        </div>          <div class="navbar-collapse collapse">          <ul class="nav navbar-nav">            <li class="active navbutton"><a href="#home">home</a>            </li>            <li class="navbutton"><a href="services">services</a>            </li>            <li class="navbutton"><a href="contact">contact</a>            </li>          </ul>        </div>        </div>    </div>  </body>  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

custom css example:

.navbar.navbar-color {    background: cyan;  }  .navbar.navbar-color .icon-bar {    background: black;  }
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />    <body data-spy="scroll" data-target="#topnav">      <div class="navbar navbar-color navbar-fixed-top" id="topnav">      <div class="container">          <div class="navbar-header">          <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">            <span class="icon-bar"></span>            <span class="icon-bar"></span>            <span class="icon-bar"></span>          </button>          <a class="navbar-brand page-scroll" href="#page-top">webinsight</a>        </div>          <div class="navbar-collapse collapse">          <ul class="nav navbar-nav">            <li class="active navbutton"><a href="#home">home</a>            </li>            <li class="navbutton"><a href="services">services</a>            </li>            <li class="navbutton"><a href="contact">contact</a>            </li>          </ul>        </div>        </div>    </div>  </body>  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>


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