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HTML 

              
                .nav
  ul(class='nav__list')
  
      li(class='nav__menu') menu
        ul(class='nav__menu-lists nav__menu--1-lists')
          each val in ['Etiam', 'Lectus', 'Netus', 'Dictum', 'Nibh']
            li(class='nav__menu-items')= val
            
      li(class='nav__menu') menu
        ul(class='nav__menu-lists nav__menu--2-lists')
          each val in ['Etiam', 'Lectus', 'Netus', 'Dictum', 'Nibh']
            li(class='nav__menu-items')= val
            
      li(class='nav__menu') menu
        ul(class='nav__menu-lists nav__menu--1-lists')
          each val in ['Etiam', 'Lectus', 'Netus', 'Dictum', 'Nibh']
            li(class='nav__menu-items')= val
            
      li(class='nav__menu') menu
        ul(class='nav__menu-lists nav__menu--1-lists')
          each val in ['Etiam', 'Lectus', 'Netus', 'Dictum', 'Nibh']
            li(class='nav__menu-items')= val
            
      li(class='nav__menu') menu
        ul(class='nav__menu-lists nav__menu--1-lists')
          each val in ['Etiam', 'Lectus', 'Netus', 'Dictum', 'Nibh']
            li(class='nav__menu-items')= val
   
  <div class='stuff'><a href='https://codepen.io/mrspok407/' class='pens' target="_blank">Check out my other pens</a><a href="https://twitter.com/mrspok407" target="_blank"><i class="fa fa-twitter" aria-hidden="true"></i></a></div>
!

CSS 

              
                html {
  box-sizing: border-box;
}

body {
  height: 100vh;
  font-family: 'Roboto', sans-serif;
  font-weight: 500;
  color: #fff;
  background-image: linear-gradient(to left bottom, #F2E3C6 0%, #A7A1A5 100%);
  overflow: hidden;
}

*,
*:before,
*:after {
  box-sizing: inherit;
  margin: 0;
  padding: 0;
}

$itemBg: #2c8fb5;

$menu1AnimSpeed: 300ms;
$menu2AnimSpeed: 175ms;
$menu3AnimSpeed: 200ms;
$menu4AnimSpeed: 300ms;
$menu5AnimSpeed: 300ms;

ul {
  list-style-type: none;
}

.nav {
  margin-top: 30px;
  text-align: center;
  width: 100%;
  &__list {
    display: inline-block;
  }
  &__menu {
    float: left;
    width: 140px;
    height: 65px;
    line-height: 65px;
    text-transform: uppercase;
    background-color: $itemBg;
    cursor: pointer;
    &:hover {
      background-color: darken($itemBg, 10%);
    }
    &:hover > .nav__menu-lists li {
      display: block;
    }
    // Menu 1
    @for $i from 1 through 5 {
      &:hover > .nav__menu--1-lists li:nth-child(#{$i}) {
        opacity: 0;
        animation: menu1 ease-in-out forwards;
        animation-duration: $menu1AnimSpeed;
        animation-delay: ($menu5AnimSpeed / 2) * ($i - 1);
        @keyframes menu1 {
          from {
            opacity: 0;
            transform: rotateX(-180deg);
          }
          to {
            opacity: 1;
            transform: rotateX(0deg);
          }
        }
      }
    }
    // Menu 2
    @for $i from 1 through 5 {
      &:hover > .nav__menu--2-lists li:nth-child(#{$i}) {
        opacity: 0;
        transform: translateY(-100%);
        animation: menu2 ease-in-out forwards;
        animation-duration: $menu2AnimSpeed;
        animation-delay: ($menu2AnimSpeed / 1.2) * ($i - 1);
        @keyframes menu2 {
          0% {
            opacity: 0;
            transform: translateY(-100%) scale(.3);
          }
          100% {
            opacity: 1;
            transform: translateY(0) scale(1);
          }
        }
      }
    }
    // Menu 3
    @for $i from 1 through 5 {
      &:hover > .nav__menu--3-lists li:nth-child(#{$i}) {
        opacity: 0;
        transform-origin: top center;
        animation: menu3 ease-in-out forwards;
        animation-duration: $menu3AnimSpeed;
        animation-delay: ($menu3AnimSpeed / 1.3) * ($i - 1);
        @keyframes menu3 {
          0% {
            opacity: 0;
            transform: rotate(-45deg) translateX(50%);
          }
          100% {
            opacity: 1;
            transform: rotate(0) translateX(0);
          }
        }
      }
    }
    // Menu 4
    @for $i from 1 through 5 {
      &:hover > .nav__menu--4-lists li:nth-child(#{$i}) {
        opacity: 0;
        transform-origin: top center;
        animation: menu4 ease-in-out forwards;
        animation-duration: $menu4AnimSpeed;
        animation-delay: ($menu4AnimSpeed / 2.4) * ($i - 1);
        @keyframes menu4 {
          0% {
            opacity: 0;
            transform: rotateY(-90deg) rotateX(-90deg);
          }
          100% {
            opacity: 1;
            transform: rotateY(0) rotateX(0);
          }
        }
      }
    }
    // Menu 5
    @for $i from 1 through 5 {
      &:hover > .nav__menu--5-lists li:nth-child(#{$i}) {
        opacity: 0;
        animation: menu5 ease-in-out forwards;
        animation-duration: $menu5AnimSpeed;
        animation-delay: ($menu5AnimSpeed / 2.4) * ($i - 1);
        @keyframes menu5 {
          0% {
            opacity: 0;
            transform:  rotateY(90deg);
          }
          100% {
            opacity: 1;
            transform:  rotateY(0);
          }
        }
      }
    }
    &-lists {
      perspective: 5000px;
    }
    &-items {
      display: none;
      width: 140px;
      height: 65px;
      background-color: $itemBg;
      &:hover {
        background-color: darken($itemBg, 10%);
      }
    }
  }
  &__menu:nth-child(1) {
    border-top-left-radius: 10px;
  }
  &__menu:last-child {
    border-top-right-radius: 10px;
  }
}

.stuff {
  position: absolute;
  bottom: 30px;
  width: 100%;
  text-align: center;
  .pens {
    margin-right: 20px;
    text-decoration: none;
    font-size: 20px;
    color: #333;
    &:hover {
      text-decoration: underline;
    }
  }
  .fa-twitter {
    position: relative;
    top: 8px;
    color: #1DA1F2;
    font-size: 50px;
  }
}
!

JS 

              
                // Hi
!
999px

Console