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HTML

              
                <header class="banner">

  <button class="toggle"><span class="line"></span>
    <span class="line"></span>
    <span class="line"></span>
    <span class="line"></span>
    <span class="sr-only">Toggle
      menu</span>
  </button>

  <nav class="nav-primary" aria-label="Primary" style="">
    <div class="menu-primary-container">
      <ul id="menu-primary" class="nav">
        <li id="menu-item-149" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-149" style="transform: scale(0, 1); opacity: 0;"><a href="#">Letter from Chairman</a></li>
        <li id="menu-item-150" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-150" style="transform: scale(0, 1); opacity: 0;"><a href="#">By The Numbers</a></li>
        <li id="menu-item-151" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-151" style="transform: scale(0, 1); opacity: 0;"><a href="#">Gallery</a></li>
        <li id="menu-item-152" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-152" style="transform: scale(0, 1); opacity: 0;"><a href="#">Community Stories</a></li>
        <li id="menu-item-153" class="menu-item menu-item-type-custom menu-item-object-custom menu-item-153" style="transform: scale(0, 1); opacity: 0;"><a href="#">Vision for Next 50 yrs</a></li>
      </ul>
    </div>
  </nav>
</header>
              
            
!

CSS

              
                $green: #186135;

.banner {
  display: flex;
  flex-wrap: wrap;
  padding-top: 1rem;
  padding-bottom: 1rem;
  width: 100%;

  button {
    margin-left: auto;
    @media only screen and (min-width: 1280px) {
      order: 3;
    }
  }

  .toggle .line {
    width: 30px;
    height: 3px;
    background-color: $green;
    display: block;
    margin: 7px 0;
    -webkit-transition: all 0.3s ease-in-out;
    -o-transition: all 0.3s ease-in-out;
    transition: all 0.3s ease-in-out;

    &:nth-child(2),
    &:nth-child(3) {
      width: 36px;
    }
  }

  .toggle:hover {
    cursor: pointer;
  }

  .toggle.is-active .line:nth-child(1),
  .toggle.is-active .line:nth-child(4) {
    opacity: 0;
  }

  .toggle.is-active .line:nth-child(2) {
    transform: translate(0, 5px) rotate(45deg);
  }

  .toggle.is-active .line:nth-child(3) {
    transform: translate(0, -5px) rotate(-45deg);
  }

  .nav-primary {
    //opacity: 0;
    //visibility: hidden;

    display: flex;
    justify-content: center;
    align-items: center;

    flex: 0 0 100%;

    transform: translate3d(-100%, -100%, 0);
    //transform: scaleY(0);
    // transform-origin: center top;

    @media only screen and (min-width: 1280px) {
      opacity: 1;
      transform: none;
      flex: 1 1 auto;
    }

    ul {
      display: flex;
      flex-direction: column;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;

      li {
        text-align: center;
        margin: 0 1rem;
        opacity: 1;

        @media only screen and (min-width: 1280px) {
          opacity: 0;
        }
      }

      > a {
        color: #fff;
        font-size: 2.5rem;
      }
    }

    @media only screen and (min-width: 1280px) {
      ul {
        flex-direction: row;

        li {
          text-align: left;

          @media only screen and (min-width: 1280px) {
            transform: scaleX(0);
            transform-origin: right center;
          }
        }
      }
    }
  }
}

.sr-only {
  display: none;
}

              
            
!

JS

              
                gsap.registerPlugin(ScrollTrigger, DrawSVGPlugin, MotionPathPlugin);

const mediaQuery = "screen and (min-width: 1280px)";
const mediaQueryList = window.matchMedia(mediaQuery);

let setBodyClass = function () {
  if (mediaQueryList.matches) {
    document.body.classList.remove("mobile");
    document.body.classList.add("desktop");
    console.log("The window is now 1280px or over");
  } else {
    document.body.classList.remove("desktop");
    document.body.classList.add("mobile");
    console.log("The window is now under 1280px");
  }
};

setBodyClass();

mediaQueryList.addEventListener("change", (event) => {
  console.log(window.innerWidth);
  setBodyClass();
});

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

const toggleMenu = gsap.timeline({ paused: true, reversed: true });

toggleMenu
  .set(menu, { autoAlpha: 1 })
  .to(menu, {
    duration: 0,
    ease: "linear",
    transform: "translate3d(0,0,0)",
    scaleY: 1
  })
  .to("header nav li", {
    duration: 0.25,
    opacity: 1,
    reversed: true,
    scaleX: 1,
    ease: "Expo.easeInOut", //
    stagger: 0.05
  });

const toggle = gsap.utils.toArray(".toggle");

toggle.forEach((t) => {
  t.addEventListener("click", function () {
    if (toggleMenu.reversed()) {
      toggleMenu.play();
    } else {
      toggleMenu.reverse(0);
    }

    $(this).toggleClass("is-active");
  });
});

menu.addEventListener("click", function (event) {
  if (!event.target.closest("ul")) {
    toggleMenu.reverse(0);
  }
});

              
            
!
999px

Console