Bootstrap animated hamburger toggle.

a.rb

.navbar-toggle .icon-bar:nth-of-type(2) {
	  top: 1px;
}

.navbar-toggle .icon-bar:nth-of-type(3) {
  	top: 2px;
}

.navbar-toggle .icon-bar {
	  position: relative;
	  transition: all 500ms ease-in-out;
}

.navbar-toggle.active .icon-bar:nth-of-type(1) {
	  top: 6px;
	  transform: rotate(45deg);
}

.navbar-toggle.active .icon-bar:nth-of-type(2) {
	  background-color: transparent;
}

.navbar-toggle.active .icon-bar:nth-of-type(3) {
	  top: -6px;
	  transform: rotate(-45deg);
}

//Don't forget the JS.

$(".navbar-toggle").on("click", function () {
    $(this).toggleClass("active");
});