CodePen Embed - Mobile navigation animation using GSAP

<!--Menu-->
<div class="menu">
  <!--Trigger-->
  <div class="menu__trigger js-menu-trigger"><span>MENU</span></div>
  <!--/Trigger-->

  <!--Logo-->
  <div class="menu__logo">
    <svg viewBox="0 0 500 500">
            <defs>
                <linearGradient id="main-gradient" x1="0%" y1="0%" x2="100%" y2="0%">
                    <stop offset="0%" style="stop-color:#EE43BD;stop-opacity:1"/>
                    <stop offset="100%" style="stop-color:#FFD779;stop-opacity:1"/>
                </linearGradient>
            </defs>
            <path class="js-logo-shape" fill="url(#main-gradient)"
                  d="M 378.1,121.2 C 408.4,150 417.2,197.9 411,245.8 404.8,293.7 383.5,341.7 353.4,370.7 303.2,419.1 198.7,427.7 144.5,383.8 86.18,336.5 67.13,221.3 111.9,161 138.6,125 188.9,99.62 240.7,90.92 292.4,82.24 345.6,90.32 378.1,121.2 Z"></path>
        </svg>
    <h1>MICRO FRONT</h1>
  </div>
  <!--Logo-->

  <!--Inner-->
  <div class="menu__inner js-menu-inner">
    <!--Inner background-->
    <ul class="menu__inner-background js-menu-inner-background">
      <li><i></i></li>
      <li><i></i></li>
      <li><i></i></li>
      <li><i></i></li>
      <li><i></i></li>
    </ul>
    <!--/Inner background-->

    <div class="menu__items-wrapper js-menu-items-wrapper">
      <ul class="menu__items-list js-menu-items-list">
        <li class="js-menu-item is-active" data-morph="M 418.1,159.8 C 460.9,222.9 497,321.5 452.4,383.4 417.2,432.4 371.2,405.6 271.3,420.3 137.2,440 90.45,500.6 42.16,442.8 -9.572,381 86.33,289.1 117.7,215.5 144.3,153.4 145.7,54.21 212.7,36.25 290.3,15.36 373.9,94.6 418.1,159.8 Z">
          <a href="#">Home</a>
        </li>
        <li class="js-menu-item" data-morph="M 402.7,215.5 C 433.9,280.4 488.1,367.2 447.7,426.8 410.1,482.2 316.7,460.2 249.7,460.6 182.8,461.1 88.08,485.5 51.26,429.5 10.29,367.3 73.19,279.4 106.9,213 141.8,144 176.6,33.65 253.9,33.7 332.2,33.75 368.8,144.9 402.7,215.5 Z">
          <a href="#">About</a>
        </li>
        <li class="js-menu-item" data-morph="M 451.5,185.8 C 441.5,266.2 339.6,305 272.3,350.2 207.7,393.6 226.7,444.7 182.6,447.9 132.8,451.4 83.97,399.9 66.37,353.1 34.6,268.4 41.16,141.8 112,85.44 186.1,26.329999999999984 313.8,54.099999999999994 396,101.4 425.2,118.2 455.6,152.4 451.5,185.8 Z">
          <a href="#">Hover Me</a>
        </li>
        <li class="js-menu-item" data-morph="M 378.1,121.2 C 408.4,150 417.2,197.9 411,245.8 404.8,293.7 383.5,341.7 353.4,370.7 303.2,419.1 198.7,427.7 144.5,383.8 86.18,336.5 67.13,221.3 111.9,161 138.6,125 188.9,99.62 240.7,90.92 292.4,82.24 345.6,90.32 378.1,121.2 Z">
          <a href="#">Contact</a>
        </li>
      </ul>
      <div class="menu__items-shape js-menu-items-shape">
        <svg id="circle" viewBox="0 0 500 500">
                    <path id="object" class="js-items-shape-path" fill="url(#main-gradient)"
                          d="M 418.1,159.8 C 460.9,222.9 497,321.5 452.4,383.4 417.2,432.4 371.2,405.6 271.3,420.3 137.2,440 90.45,500.6 42.16,442.8 -9.572,381 86.33,289.1 117.7,215.5 144.3,153.4 145.7,54.21 212.7,36.25 290.3,15.36 373.9,94.6 418.1,159.8 Z"></path>
                </svg>
      </div>

    </div>

    <!--Trigger-->
    <div class="menu__trigger menu__trigger--close js-menu-close"><span>Close</span></div>
    <!--/Trigger-->
  </div>
  <!--/Inner-->

</div>
<!--/Menu-->

body {
  font-family: "Montserrat", sans-serif;
  height: 100vh;
  background-image: linear-gradient(135deg, #8f24ed 30%, #107cb3 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  @media only screen and (max-width: 600px) {
    display: block;
  }
}
* {
  outline: none;
  -webkit-tap-highlight-color: rgba(255, 255, 255, 0);
}

*,
:after,
:before {
  box-sizing: border-box;
}

.menu {
  width: 320px;
  height: 568px;
  background: #fff;
  border-radius: 10px;
  box-shadow: 0 0 0px 12px rgba(0, 0, 0, 0.1), 0 0 1px 1px rgba(0, 0, 0, 0.1),
    inset 0 0 0 12px rgba(255, 255, 255, 1);
  overflow: hidden;
  position: relative;
  background-color: #eaecef;
  margin: 30px auto;
  &__trigger {
    position: absolute;
    top: 24px;
    right: 26px;
    cursor: pointer;
    &:after {
      position: absolute;
      content: "";
      width: 100%;
      height: 12px;
      left: 0;
      transform: translateX(-7px);
      top: 8px;
      background-image: linear-gradient(0deg, #ee43bd 0%, #ffd779 100%);
      transition: all 0.2s ease;
      will-change: transform;
    }
    span {
      position: relative;
      z-index: 1;
      font-weight: 900;
      letter-spacing: -1px;
      text-transform: uppercase;
      font-size: 16px;
    }
    &:hover {
      &:after {
        transform: translateX(0);
      }
    }

    &--close {
      visibility: hidden;
      opacity: 0;
    }
  }
  &__logo {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    padding: 5px;
    transform: translateY(-50%);
    cursor: pointer;
    svg {
      width: 185px;
      margin: 0 auto;
      display: block;
    }
    h1 {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      font-weight: 900;
      font-size: 36px;
      text-align: center;
      letter-spacing: -1.5px;
      line-height: 28px;
    }
  }
  &__inner {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    z-index: 1;
    border-radius: 10px;
    overflow: hidden;
    visibility: hidden;
    opacity: 0;
  }
  &__inner-background {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    list-style-type: none;
    padding: 0;
    margin: 0;
    font-size: 0;

    li {
      position: relative;
      display: inline-block;
      height: 100%;
      overflow: hidden;
      &:first-child {
        width: 21px;
      }
      &:nth-child(2) {
        width: calc(33.33% - 14px);
      }
      &:nth-child(3) {
        width: calc(33.33% - 14px);
      }
      &:nth-child(4) {
        width: calc(33.33% - 14px);
      }
      &:last-child {
        width: 21px;
      }
      i {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        background-color: #fff;
        opacity: 0;
        visibility: hidden;
        &:after {
          content: "";
          display: block;
          height: 100%;
          width: 1px;
          background: #edeff5;
          z-index: 2;
        }
      }
    }
  }
  &__items-wrapper {
    position: relative;
    padding-left: 22px;
  }
  &__items-list {
    position: relative;
    z-index: 1;
    li {
      margin-bottom: 8px;
      a {
        color: #282828;
        text-decoration: none;
        font-size: 50px;
        line-height: 50px;
        text-transform: uppercase;
        display: block;
        letter-spacing: -1.2px;
        font-weight: 900;
      }
    }
  }
  &__items-shape {
    position: absolute;
    left: -32px;
    top: -60px;
    svg {
      position: relative;
      display: block;
      width: 140px;
      height: 140px;
      min-height: 150px;
      margin: 0 auto;
    }
  }
}

View Compiled

function menu() {
  var menuInner = $(".js-menu-inner"),
    menuTrigger = $(".js-menu-trigger"),
    menuInnerBackgroundItem = $(".js-menu-inner-background").find("i"),
    menuItem = $(".js-menu-items-list").find("li"),
    menuItemsShape = $(".js-menu-items-shape"),
    menuClose = $(".js-menu-close"),
    timeline = new TimelineMax({
      paused: true
    }),
    logoShape = $(".js-logo-shape"),
    logoShapePath =
      "M 189,80.37 C 243,66.12 307.3,87.28 350.9,124.1 389.3,156.6 417,211.2 418.1,263.4 419.1,305.7 401.8,355.6 368.5,379.1 298.8,428 179.2,446.4 117.6,386.3 65.4,335.3 78.55,230.3 105.5,160.5 119.7,123.6 152.6,89.85 189,80.37 Z",
    _self,
    linksWrapper = $(".js-menu-items-wrapper"),
    linksItems = $(".js-menu-items-list").find("li"),
    activeItem = $(".js-menu-item.is-active"),
    activeItemPosition = activeItem.position().top,
    menuItemsShapePath = $(".js-items-shape-path"),
    topOffset = 8;

  timeline
    .to(
      menuInner,
      1,
      {
        autoAlpha: 1,
        ease: Power4.easeOut
      },
      "start"
    )
    .fromTo(
      menuInnerBackgroundItem,
      0.25,
      {
        x: "-100%",
        autoAlpha: 0
      },
      {
        x: "0%",
        autoAlpha: 1,
        ease: Power1.easeOut
      },
      "start"
    )
    .staggerFromTo(
      menuItem,
      0.4,
      {
        x: -30,
        autoAlpha: 0
      },
      {
        x: 0,
        autoAlpha: 1,
        delay: 0.35,
        ease: Back.easeOut.config(1)
      },
      0.15,
      "start"
    )
    .fromTo(
      menuItemsShape,
      0.25,
      {
        scale: 0.7,
        autoAlpha: 0
      },
      {
        scale: 1,
        autoAlpha: 1,
        delay: 0.95,
        ease: Back.easeOut.config(1.7)
      },
      "start"
    )
    .fromTo(
      menuClose,
      0.2,
      {
        x: -10,
        autoAlpha: 0
      },
      {
        x: 0,
        autoAlpha: 1,
        delay: 1,
        ease: Power1.easeOut
      },
      "start"
    );

  function _logoShapeAnimation() {
    TweenMax.to(logoShape, 3, {
      attr: { d: logoShapePath },
      repeat: -1,
      yoyo: true,
      ease: Power0.easeNone
    });
  }

  function _hoverAnimation() {
    TweenMax.set(menuItemsShape, {
      y: activeItemPosition + topOffset
    });

    linksItems.on({
      mouseenter: function() {
        _self = $(this);
        var selfParent = _self.closest(linksWrapper),
          targetCircle = selfParent.find(menuItemsShape),
          circlePosition = _self.position().top;

        TweenMax.to(targetCircle, 0.4, {
          y: circlePosition + topOffset,
          ease: Power2.easeOut
        });

        TweenMax.to(menuItemsShapePath, 1, { morphSVG: this.dataset.morph });
      }
    });

    linksWrapper.on({
      mouseleave: function() {
        _self = $(this);
        var selfParent = _self.closest(linksWrapper),
          activeLink = selfParent.find(activeItem),
          targetCircle = selfParent.find(menuItemsShape),
          activeLinkPosition = activeLink.position().top;

        TweenMax.to(targetCircle, 0.4, {
          y: activeLinkPosition + topOffset,
          ease: Power2.easeOut
        });

        TweenMax.to(menuItemsShapePath, 1, { morphSVG: menuItemsShapePath });
      }
    });
  }

  menuTrigger.on("click", function() {
    timeline.play();
  });

  menuClose.on("click", function() {
    timeline.timeScale(1.25);
    timeline.reverse();
  });

  _logoShapeAnimation();
  _hoverAnimation();
}

menu();

This Pen is owned by Dejan Babić on CodePen.

See more by @microfront on CodePen

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