<html>

<head>
  <meta charset="utf-8">
  
  <title></title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<div id="navbarContainer">
  <div id="navbar">
    <div id="bubbleWrapper">
      <div id="bubble1" class="bubble"><span class="icon"><i class="fas fa-home"></i></span></div>
      <div id="bubble2" class="bubble"><span class="icon"><i class="fab fa-twitter"></i></span></div>
      <div id="bubble3" class="bubble"><span class="icon"><i class="fas fa-bell"></i></span></div>
      <div id="bubble4" class="bubble"><span class="icon"><i class="fas fa-user"></i></span></div>
    </div>
    <div id="menuWrapper">
      <div id="menu1" class="menuElement" onclick="move('1', '50px', '#ffcc80')"><i class="fas fa-home"></i></div>
      <div id="menu2" class="menuElement" onclick="move('2', '150px', '#81d4fa')"><i class="fab fa-twitter"></i></div>
      <div id="menu3" class="menuElement" onclick="move('3', '250px', '#c5e1a5')"><i class="fas fa-bell"></i></div>
      <div id="menu4" class="menuElement" onclick="move('4', '350px', '#ce93d8')"><i class="fas fa-user"></i></div>
    </div>
  </div>
  <div id="bgWrapper">
    <div id="bg"></div>
    <div id="bgBubble"></div>
  </div>
</div>

  <svg width="0" height="0" >
    <defs>
      <filter id="goo">
        <feGaussianBlur in="SourceGraphic" stdDeviation="20" result="blur" id="blurFilter"/>
        <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 30 -15" result="goo" />
        <feComposite in="SourceGraphic" in2="goo" operator="atop"/>
      </filter>
    </defs>
  </svg>

</body>

</html>

body {
  background: #37474f;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
  overflow: hidden;
}

#navbarContainer{
  width: 400px;
  min-width: 400px;
  height: 70vh;
  background-color: #ffcc80;
  border-radius: 20px;
  display: flex;
  justify-content: flex-end;
  flex-direction: column;
  overflow: hidden;
  position: relative;
  box-shadow: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
}

#navbar{
  width: 100%;
  height: 60px;
  background-color: #fff;
  position: absolute;
}

#bubbleWrapper{
  position: absolute;
  display: flex;
  justify-content: space-around;
  width: 100%;
  bottom: 25px;
}

.bubble{
  background-color: #fff;
  width: 50px;
  height: 50px;
  bottom: 85px;
  border-radius: 50%;
  z-index: 1;
  transform: translateY(120%);
  display: flex;
  justify-content: center;
  align-items: center;
}
.icon{
  opacity: 0;
}

#bubble1{
  transform: translateY(0%);
  box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
  > span{
    opacity: 0.7;
  }
}

#bgWrapper{
  filter: url(#goo);
  width: 100%;
  height: 100px;
  position: absolute;
  bottom: 60px;
}
#bg{
  background-color: #ffcc80;
  width: 120%;
  height: 100%;
  margin-left: -10%;
}
#bgBubble{
  position: absolute;
  background-color: #ffcc80;
  width: 70px;
  height: 70px;
  border-radius: 50%;
  bottom: -50px;
  left: 50px;
  transform: translateX(-50%);
}

#menuWrapper{
  position: absolute;
  width: 100%;
  display: flex;
  justify-content: space-around;
}

.menuElement{
  opacity: 0.4;
  transform: translateY(100%);
  cursor: pointer;
  &:hover{
    opacity: 0.5;
  }
}

#contentWrapper{
  position: absolute;
  top: 50%;
  width: 100%;
  transform: translateY(-50%);
  display: flex;
  justify-content: center;
  align-items: center;
  h2{
    color: #fff;
    font-family: sans-serif;
    font-weight: 400;
  }
}
.content{
  display: none;
  opacity: 0;
}
View Compiled
 function move(id, position, color) {
    var tl = gsap.timeline();
    tl.to("#bgBubble", {duration: 0.15, bottom: "-30px", ease: "ease-out"}, 0)
      .to("#bubble1", {duration: 0.1, y: "120%", boxShadow: 'none', ease: "ease-out",}, 0)
      .to("#bubble2", {duration: 0.1, y: "120%", boxShadow: 'none', ease: "ease-out",}, 0)
      .to("#bubble3", {duration: 0.1, y: "120%", boxShadow: 'none', ease: "ease-out",}, 0)
      .to("#bubble4", {duration: 0.1, y: "120%", boxShadow: 'none', ease: "ease-out",}, 0)
      .to(".icon", {duration: 0.05, opacity: 0, ease: "ease-out",}, 0)
      .to("#bgBubble", {duration: 0.2, left: position, ease: "ease-in-out"}, 0.1)
      .to("#bgBubble", {duration: 0.15, bottom: "-50px", ease: "ease-out"}, '-=0.2')
      .to(`#bubble${id}`, {duration: 0.15, y: "0%", opacity: 1, boxShadow: '0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24)', ease: "ease-out"}, '-=0.1')
      .to(`#bubble${id}> span`, {duration: 0.15, y: "0%", opacity: 0.7, ease: "ease-out"}, '-=0.1')
      .to("#navbarContainer", {duration: 0.3, backgroundColor: color, ease: "ease-in-out"}, 0)
      .to("#bg", {duration: 0.3, backgroundColor: color, ease: "ease-in-out"}, 0)
      .to("#bgBubble", {duration: 0.3, backgroundColor: color, ease: "ease-in-out"}, 0)
  }

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.0-2/css/all.min.css

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/gsap/3.3.3/gsap.min.js