<div class="demo">
  <div class="menu-icon">
    <input class="menu-icon__cheeckbox" type="checkbox" />
    <div>
      <span></span>
      <span></span>
    </div>
  </div>
</div>

.demo {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100vw;
  height: 100vh;
  background-image: linear-gradient(
    to top,
    #dad4ec 0%,
    #dad4ec 1%,
    #f3e7e9 100%
  );
  //  for demo
  .menu-icon {
    transform: scale(1.5);
  }
}

:root {
  --bar-bg: #212529;
}

.menu-icon {
  position: relative;
  width: 50px;
  height: 50px;
  cursor: pointer;

  .menu-icon__cheeckbox {
    display: block;
    width: 100%;
    height: 100%;
    position: relative;
    cursor: pointer;
    z-index: 2;
    -webkit-touch-callout: none;
    position: absolute;
    opacity: 0;
  }
  div {
    margin: auto;
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    width: 22px;
    height: 12px;
  }
  span {
    position: absolute;
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--bar-bg, #000);
    border-radius: 1px;
    transition: all 0.2s cubic-bezier(0.1, 0.82, 0.76, 0.965);

    &:first-of-type {
      top: 0;
    }
    &:last-of-type {
      bottom: 0;
    }
  }
  &.active,
  .menu-icon__cheeckbox:checked + div {
    span {
      &:first-of-type {
        transform: rotate(45deg);
        top: 5px;
      }
      &:last-of-type {
        transform: rotate(-45deg);
        bottom: 5px;
      }
    }
  }

  &.active:hover span:first-of-type,
  &.active:hover span:last-of-type,
  &:hover .menu-icon__cheeckbox:checked + div span:first-of-type,
  &:hover .menu-icon__cheeckbox:checked + div span:last-of-type {
    width: 22px;
  }

  &:hover {
    // no need hover effect on mobile.
    @media (min-width: 1024px) {
      span:first-of-type {
        width: 26px;
      }

      span:last-of-type {
        width: 12px;
      }
    }
  }
}

// Can be used with JavaScript
// -----------------------------
// const icnMenu = document.querySelector('.menu-icon');
// icnMenu.addEventListener('click', () => {
//  icnMenu.classList.toggle('active');
// });