       <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" href="index.html"><img src="img/logo.png" alt="logo"/></a>
                </div>
                <div class="navbar-collapse collapse ">
                    <ul class