html - Animated 'X' icon for bootstrap toggle -

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i attempting animate horizontal lines in navbar 'x' when page reduced in size.

my navbar code follows:

<nav class="navbar navbar-default navbar-fixed-top" role="navigation">         <div class="container">             <!-- brand , toggle grouped better mobile display -->             <div class="navbar-header">                 <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">                     <span class="sr-only">toggle navigation</span>                     <span class="icon-bar"></span>                     <span class="icon-bar"></span>                     <span class="icon-bar"></span>                 </button>                 <a class="navbar-brand" href="index.html">company</a>             </div>             <!-- collect nav links, forms, , other content toggling -->             <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">                 <ul class="nav navbar-nav navbar-right">                     <li class="dropdown">                         <a href="#" class="dropdown-toggle" data-toggle="dropdown">about<b class="caret"></b></a>                         <ul class="dropdown-menu">                             <li>                                 <a href="about.html">about us</a>                             </li>                             <li>                                 <a href="certification.html">certification</a>                             </li>                             <li>                                 <a href="downloads.html">download pdf</a>                             </li>                         </ul>                     </li>                     <li>                         <a href="products.html">products</a>                     </li>                     <li>                         <a href="inquiry.html">inquiry</a>                     </li>                     <li>                         <a href="events.html">events</a>                     </li>                     <li>                         <a href="contact.html">contact</a>                     </li>                     <li>                         <a href="#">login</a>                     </li>                 </ul>             </div>             <!-- /.navbar-collapse -->         </div>         <!-- /.container -->     </nav>

when attempt use css shown here not work. there need modify navbar specifically? notice when add css, :

 &:hover {     background: transparent !important;   }

the closing curly brace not recognize opening one. missing?

it's because tutorial using less, css pre-processor, extending css language.

however, have use compiled css, , make few changes.

in html, add classes bars in order distinguish each of them :

<span class="icon-bar top-bar"></span> <span class="icon-bar middle-bar"></span> <span class="icon-bar bottom-bar"></span>

also, init button class collapsed, or first render 'x'.

then add css compiled :

.navbar-toggle {   border: none;   background: transparent !important; } .navbar-toggle:hover {   background: transparent !important; } .navbar-toggle .icon-bar {   width: 22px;   transition: 0.2s; } .navbar-toggle .top-bar {   transform: rotate(45deg);   transform-origin: 10% 10%; } .navbar-toggle .middle-bar {   opacity: 0; } .navbar-toggle .bottom-bar {   transform: rotate(-45deg);   transform-origin: 10% 90%; } .navbar-toggle.collapsed .top-bar {   transform: rotate(0); } .navbar-toggle.collapsed .middle-bar {   opacity: 1; } .navbar-toggle.collapsed .bottom-bar {   transform: rotate(0); }

and should work charm.

here's jsfiddle : demo


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