Mobile menu icon #mobile #menu

mobile-menu.html

<div id="mobile-menu-icon">
  <i></i>
  <i></i>
  <i></i>
  <i></i>
  <span>menu</span>
</div>

mobile-menu.js

// ! mobile menu
const mobileMenuContainer = '.site-header'
const mobileMenu = $('.site-header #site-navigation')
const mobileMenuIcon = '.site-header #mobile-menu-icon'
const animateTime = 200
function autoHeightAnimate (element, time) {
  const curHeight = element.height() // Get Default Height
  const autoHeight = element.css('height', 'auto').height() // Get Auto Height
  element.height(curHeight) // Reset to Default Height
  element.stop().animate({ height: autoHeight }, time) // Animate to Auto Height
}

// toggle class
$(mobileMenuIcon).click(function () {
  if ($(mobileMenuContainer).hasClass('mobile-menu-open')) {
    $(mobileMenuContainer).removeClass('mobile-menu-open')
    mobileMenu.stop().animate({ height: '0' }, animateTime)
  } else {
    $(mobileMenuContainer).addClass('mobile-menu-open')
    autoHeightAnimate(mobileMenu, animateTime)
  }
})

// activate on viewport width. requires viewportCore
$(window).resize(viewportCore.waitForIdle(function () {
  if (viewportCore.viewportWidth > 768) {
    // Clear out mobile-menu.
    $(mobileMenuContainer).removeClass('mobile-menu-open')
    mobileMenu.css('height', '')
  }
}, 200))

mobile-menu.scss

// ! mobile menu
header {
  
  nav {
    @media (max-width: 768px) {
      overflow: hidden;
      padding: 0 !important;
      height: 0;
    }
  }

  &.mobile-menu-open {
  
    #mobile-menu-icon {
    
      i:nth-child(1) {
        top: 6px;
        left: 50%;
        width: 0;
      }

      i:nth-child(2) {
        transform: rotate(45deg);
      }

      i:nth-child(3) {
        transform: rotate(-45deg);
      }

      i:nth-child(4) {
        top: 6px;
        left: 50%;
        width: 0;
      }
    }
  }

  #mobile-menu-icon {
    border-width: 17px 15px;
    border-style: solid;
    border-color: rgba($white, 0);
    border-radius: 3px 0 0 3px;
    position: absolute;
    top: 14px;
    right: 0;
    width: 56px;
    height: 49px;
    cursor: pointer;
    @media #{$breakpoint-md-up} {
      top: -99999px;
    }

    span {
      color: $white;
      position: absolute;
      top: -3px;
      right: 32px;
    }

    i {
      transform: rotate(0deg);
      transition: all 0.25s cubic-bezier(0.55, 0, 0.1, 1);
      border-radius: 7px;
      background-color: $white;
      display: block;
      position: absolute;
      left: 0;
      width: 100%;
      height: 3px;
    }

    i:nth-child(1) {
      top: 0;
    }

    i:nth-child(2),
    i:nth-child(3) {
      top: 6px;
    }

    i:nth-child(4) {
      top: 12px;
    }
  }

  #mobile-menu-icon:hover {
    -webkit-tap-highlight-color: transparent;
  }
}