There are lots of posts online about that trendy (and awesome) transition from the hamburger icon (when the menu is collapsed) to that “x” (when the mobile menu has been expanded). This should be pulled off by CSS3 animations, of course.
Below is the code , you can copy and paste ,run directly..
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<style>
.navbar-toggle {
border: none;
background: transparent !important;
}
.navbar-toggle:hover {
background: transparent !important;
}
.navbar-toggle .icon-bar {
width: 22px;
transition: all 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);
}
</style>
</head>
<body>
<div class="container">
<!-- Static navbar -->
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar top-bar"></span>
<span class="icon-bar middle-bar"></span>
<span class="icon-bar bottom-bar"></span>
</button>
<a class="navbar-brand" href="#">Project name</a>
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Contact</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li class="dropdown-header">Nav header</li>
<li><a href="#">Separated link</a></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li class="active"><a href="./">Default <span class="sr-only">(current)</span></a></li>
<li><a href="../navbar-static-top/">Static top</a></li>
<li><a href="../navbar-fixed-top/">Fixed top</a></li>
</ul>
</div><!--/.nav-collapse -->
</div><!--/.container-fluid -->
</nav>
<!-- Main component for a primary marketing message or call to action -->
<div class="jumbotron">
<h1>Navbar example</h1>
<p>This example is a quick exercise to illustrate how the default, static navbar and fixed to top navbar work. It includes the responsive CSS and HTML, so it also adapts to your viewport and device.</p>
<p>
<a class="btn btn-lg btn-primary" href="../../components/#navbar" role="button">View navbar docs »</a>
</p>
</div>
</div> <!-- /container -->
</body>
</html>
Below is the code , you can copy and paste ,run directly..
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<style>
.navbar-toggle {
border: none;
background: transparent !important;
}
.navbar-toggle:hover {
background: transparent !important;
}
.navbar-toggle .icon-bar {
width: 22px;
transition: all 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);
}
</style>
</head>
<body>
<div class="container">
<!-- Static navbar -->
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar top-bar"></span>
<span class="icon-bar middle-bar"></span>
<span class="icon-bar bottom-bar"></span>
</button>
<a class="navbar-brand" href="#">Project name</a>
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Contact</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li class="divider"></li>
<li class="dropdown-header">Nav header</li>
<li><a href="#">Separated link</a></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li class="active"><a href="./">Default <span class="sr-only">(current)</span></a></li>
<li><a href="../navbar-static-top/">Static top</a></li>
<li><a href="../navbar-fixed-top/">Fixed top</a></li>
</ul>
</div><!--/.nav-collapse -->
</div><!--/.container-fluid -->
</nav>
<!-- Main component for a primary marketing message or call to action -->
<div class="jumbotron">
<h1>Navbar example</h1>
<p>This example is a quick exercise to illustrate how the default, static navbar and fixed to top navbar work. It includes the responsive CSS and HTML, so it also adapts to your viewport and device.</p>
<p>
<a class="btn btn-lg btn-primary" href="../../components/#navbar" role="button">View navbar docs »</a>
</p>
</div>
</div> <!-- /container -->
</body>
</html>
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Thankyou.
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