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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <div class="cover-back cover-back-body js-cover-back-body"></div>

<div class="tabs js-tabs">

  <div class="cover-back cover-back-tabs js-cover-back-tabs"></div>

  <div class="tabs-container">
    <div class="tab-item js-tab-item" data-gradient-start="7DA4FF" data-gradient-stop="4161C8" data-tab-color="7E82EC">
      <i class="fas fa-home"></i>
    </div>

    <div class="tab-item js-tab-item" data-gradient-start="FF7DC2" data-gradient-stop="B7C841" data-tab-color="ECB57E">
      <i class="fas fa-search"></i>
    </div>

    <div class="tab-item tab-item--middle js-tab-item js-tab-item-main-control">
      <i class="fas fa-plus"></i>
    </div>

    <div class="tab-item js-tab-item" data-gradient-start="7DC2FF" data-gradient-stop="C8419F" data-tab-color="B97EEC">
      <i class="far fa-heart"></i>
    </div>

    <div class="tab-item js-tab-item" data-gradient-start="B1FF7D" data-gradient-stop="41B5C8" data-tab-color="7EECAE">
      <i class="fas fa-cog"></i>
    </div>
  </div>
</div>
!

CSS 

              
                * { box-sizing: border-box; }

html,
body {
  position: relative;

  display: flex;
  align-items: center;
  justify-content: center;
  
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  
  background-repeat: no-repeat;
  background-size: cover;
}

.cover-back {
  content: '';

  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;

  opacity: 1;

  transition: all 1s cubic-bezier(0.4, 0, 1, 1);
}

.cover-back-body { background-image: linear-gradient(#7da4ff, #4161c8); }

.cover-back-tabs { background-color: #7E82EC; }

.tabs {
  position: relative;
  z-index: 1;

  display: flex;
  justify-content: center;

  width: 800px;
  overflow: hidden;
  
  border-radius: 293px;
  box-shadow: 0 20px 35px rgba(0, 0, 0, .30);
  transition: all .4s cubic-bezier(0.65, 0.05, 0.36, 1);
}

.tabs-container {
  z-index: 2;

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

  width: 800px;
  height: 150px;
}

.tab-item {
  width: 100px;
  height: 100px;
  margin: 0 17.5px;
  
  color: #E9E9E9;
  opacity: 0;
  transform: scale(0);

  font-size: 50px;
  text-align: center;
  line-height: 100px;

  transition: all .9s cubic-bezier(0.68, -0.55, 0.27, 1.55);
}

.tab-item:nth-child(1){ transition-delay: .3s; }

.tab-item:nth-child(2){ transition-delay: .5s; }

.tab-item:nth-child(4){ transition-delay: .7s; }

.tab-item:nth-child(5){ transition-delay: .9s; }

.tab-item{ cursor: pointer; }

.tab-item--middle {
  opacity: 1;
  transform: scale(1);
  border-radius: 50%;
  color: #7074E8;
  background-color: #A2B2FF;
}

/* Animations */

@keyframes show-tab-items {
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes hide-tab-items {
  to {
    opacity: 0;
    transform: scale(0);
  }
}

@keyframes add-background {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes remove-background {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* Javascript part */

.js-tabs-init {
  width: 150px;
  border-radius: 50%;
}

.js-cover-back-animate {
  opacity: 0;
  transition: all 5s;
  animation: add-background linear 2s forwards;
}

.js-tab-item-show {
  opacity: 1;
  transform: scale(1);
};

.js-tab-item-active { position: relative; }

.js-tab-item-active:after {
  content: '';

  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);

  width: 10px;
  height: 10px;
  border-radius: 50%;

  border: 3px solid #ff5252;
  background-color: white;
  opacity: .6;
}
!

JS 

              
                /**
 * The tab element
 * @type {Element}
 */
var tabs = document.querySelector('.js-tabs');

/**
 * All tabs items execept the one that animates the tab
 * @type {Element}
 */
var tabItems = document.querySelectorAll('.js-tab-item:not(.js-tab-item-main-control)');

/**
 * The tab element that animates the tab
 * @type {Element}
 */
var tabItemMainControl = document.querySelector('.js-tab-item-main-control');

/**
 * The background of the body
 * @type {Element}
 */
var coverBackBody = document.querySelector('.js-cover-back-body');

/**
 * The background of the tabs menu
 * @type {Element}
 */
var coverBackTabs = document.querySelector('.js-cover-back-tabs');

/*
  Trigger the animation of the tabs
    Open the tab and show all tabs items
 */
tabItemMainControl.addEventListener('click', function(){
  if(tabs.classList.contains('js-tabs-init')){
    tabs.classList.remove('js-tabs-init');
    tabItemMainControl.style.transform = 'rotate(45deg)';
    for(var i = 0; i < tabItems.length; i++){
      tabItems[i].classList.add('js-tab-item-show');
    }
  }else{
    for(var i = 0; i < tabItems.length; i++){
      tabItems[i].classList.remove('js-tab-item-show');
    }
    setTimeout(function(){
      tabItemMainControl.style.transform = 'rotate(0deg)';
      tabs.classList.add('js-tabs-init');
    }, 2000);
  }
});

/*
  Browse all tabs button
    - To change background
 */
for(var i = 0; i < tabItems.length; i++){

  tabItems[0].classList.add('js-tab-item-active');

  tabItems[i].addEventListener('click', function(){

    //Toggle the active tab item
    var tabActive = document.querySelector('.js-tab-item-active');
    tabActive.classList.remove('js-tab-item-active');
    this.classList.add('js-tab-item-active');

    //Remove the body's background
    coverBackBody.style.animationName = 'remove-background';
    coverBackBody.style.animationDuration = '1s';
    coverBackBody.style.animationTimingFunction = 'linear';
    coverBackBody.style.animationFillMode = 'forwards';

    //Remove the tabs background
    coverBackTabs.style.width = 0;

    var self = this;
    window.setTimeout(function(){

      //Change the body's background
      coverBackBody.style.animationName = 'add-background';
      coverBackBody.style.backgroundImage = 'linear-gradient(#' + self.dataset.gradientStart + ', #' + self.dataset.gradientStop + ')'; 
      coverBackBody.classList.add('js-cover-back-animate');

      //Change the tabs background
      coverBackTabs.style.backgroundColor = '#' + self.dataset.tabColor;
      coverBackTabs.style.width = '100%';


    }, 1200);
  })
}

//Initial state of the tab
tabs.classList.add('js-tabs-init');
!
999px

Console