switcher

<div class="sandwitch">
    <div class="sandwitch__line sandwitch__line--top"></div>
    <div class="sandwitch__line sandwitch__line--middle"></div>
    <div class="sandwitch__line sandwitch__line--bottom"></div>
</div>

.sandwitch
  .sandwitch__line.sandwitch__line--top
  .sandwitch__line.sandwitch__line--middle
  .sandwitch__line.sandwitch__line--bottom



	    let sandwitch = function () {
        $('.sandwitch').on('click', function () {
        	$('.top-menu nav > ul').slideToggle();
            $(this).toggleClass('sandwitch--active');
        });
    };
    sandwitch();


.sandwitch {
	position: relative;
	width: 23px;
	height: 14px;
	cursor: pointer;
}

.sandwitch--active .sandwitch__line--top {
	top: 6px;
	transform: rotate(45deg);
}

.sandwitch--active .sandwitch__line--middle {
	opacity: 0;
}

.sandwitch--active .sandwitch__line--bottom {
	top: 6px;
	transform: rotate(-45deg);
}

.sandwitch__line {
	position: absolute;
	left: 0;
	display: block;
	width: 100%;
	height: 2px;
	transition: all linear 0.1s;
	background-color: #fff;
}

.sandwitch__line--top {
	top: 0;
}

.sandwitch__line--middle {
	top: 6px;
}

.sandwitch__line--bottom {
	top: 12px;
}