<div class="center">
      <div class="menu">
        <div class="line"></div>
      </div>
    </div>

.center {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.menu {
  width: 40px;
  cursor: pointer;
}

.menu .line,
.menu:before,
.menu:after {
  height: 3px;
  display: block;
  background-color: black;
  content: "";
  margin: 9px 0;
  transition: all 0.3s;
}

.menu.active:before {
  transform: translateY(12px) rotate(225deg);
}

.menu.active .line {
  transform: scale(1.5);
  opacity: 0;
}

.menu.active:after {
  transform: translateY(-12px) rotate(-225deg);
}

const menu = document.querySelector(".menu");

menu.addEventListener("click", () => {
  menu.classList.toggle("active");
});