Анимируем меню-гамбургер

<a class="btn responsive-menu pull-right" data-toggle="collapse" data-target=".navbar-collapse">
   <div class="burger-menu">
      <div></div>
      <div></div>
      <div></div>                     
   </div>
</a>

      .btn.responsive-menu{
       display: table;
       -webkit-transition: all ease-in-out 0.3s;
            transition: all ease-in-out 0.3s;
            background: transparent;
          box-shadow: none;
   }   
   .btn.responsive-menu .burger-menu{
      padding: 5px ;
   }
   .btn.responsive-menu .burger-menu>div{
      width: 100%;
       height: 4px;
       margin: 5px 0;
       border-radius: 2px;
      background: #01151c;
       -webkit-transition: all ease-in-out 0.3s;
          transition: all ease-in-out 0.3s;
   }
   .btn.responsive-menu.open{
      background: #01151c;      
   }
   .btn.responsive-menu.open .burger-menu>div{
      transform: rotate(-45deg);
       background: #43b8b5;
   }
   .btn.responsive-menu.open .burger-menu>div:first-child{
      transform: rotate(-45deg) translate(-6px, 6px);
   }
   .btn.responsive-menu.open .burger-menu>div:last-child{
      transform: rotate(45deg) translate(-6px, -7px);
   }

$('.btn.responsive-menu').click(function(){
   
   $(this).toggleClass('open');      
   
});