Animasyonlu Hamburger Menü

<style>
.hamburger {
  width: 40px;
  height: 30px;
  position: relative;
  cursor: pointer;
}

.hamburger span {
  display: block;
  position: absolute;
  height: 4px;
  width: 100%;
  background: #333;
  border-radius: 4px;
  transition: .25s ease-in-out;
}

.hamburger span:nth-child(1) {
  top: 0px;
}

.hamburger span:nth-child(2), .hamburger span:nth-child(3) {
  top: 13px;
}

.hamburger span:nth-child(4) {
  top: 26px;
}

.hamburger.active span:nth-child(1) {
  top: 13px;
  width: 0%;
  left: 50%;
}

.hamburger.active span:nth-child(2) {
  transform: rotate(45deg);
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg);
}

.hamburger.active span:nth-child(4) {
  top: 13px;
  width: 0%;
  left: 50%;
}
</style>

<div class="hamburger">
  <span></span>
  <span></span>
  <span></span>
  <span></span>
</div>

<script>
  document.querySelector(".hamburger").addEventListener("click", function() {
    this.classList.toggle("active");
  });
</script>