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CSS

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JavaScript

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HTML 

              
                section.not
  ul.not__nav
    li
      i.material-icons fingerprint
      a(href="#") log-in
    li
      i.material-icons face
      a(href="#") clients
    li
      i.material-icons favorite
      a(href="#") favorites
    li.is-active
      i.material-icons accessibility
      a(href="#") news
        ul.not__nav-sub
          li
            i.material-icons remove_red_eye
            span 12
          li
            i.material-icons comment
            span 33
          li
            i.material-icons account_circle
            span 22
    li
      i.material-icons find_in_page
      a(href="#") search
!

CSS 

              
                $blue: rgb(26,36,56);
$gold: rgb(247, 230, 183);
$offwhite: rgb(229, 229, 229);
$dark: rgb(22,22,22);

body{
  font-family: 'Robot', sans-serif;
  margin: 50px;
  -webkit-font-smoothing: antialiased;
}

.not{
  background: $offwhite;
  margin: 0px auto;
  min-height: 60vh;
  padding: 30px;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 50px;
  
  &__nav{
    display:flex;
    background: $blue;
    color: $gold;
    list-style-type: none;
    box-shadow: 0px 20px 30px -5px rgba($dark, 0.5);
    border-radius: 3px;
    & > li{
      display: flex;
      justify-content: center;
      flex-grow: 1;
      padding: 10px 20px;
      height: 30px;
      width: 80px;
      font-size: 12px;
      cursor: pointer;
      position:relative;
      transition: all 400ms ease-in-out;
      perspective: 1000px;
      
      & i{
        color: rgba($gold, 0.7);
        font-size: 22px;
      }
      
      & a {
        text-decoration: none;
        color: $gold;
        position: absolute;
        top:65%;
        left: 50%;
        transform: translateX(-50%);
        
      }
      &:hover{
        background:lighten($blue, 10%);
      }
      
      &.is-active{
        box-shadow: 0px -2px 0px $gold inset;
        background: lighten($blue, 10%);
        .not__nav-sub{
          display: flex;
          animation: flag 1000ms cubic-bezier(0.92,-0.54, 0, 1.85) forwards;
          transform-origin: center 70px;
          transform-style: preserve-3D;
          
          @keyframes flag{
            0%{
              opacity:0;
              transform: scale(0.1) rotate(60deg) translateY(60px) rotateX(150deg);
            }
            50%{
            transform: rotate(-10deg) rotateX(-2deg);
            opacity: 1;
            }
            70%{
            transform: rotate(3deg);
            }
            100%{
              transform: scale(1);
            }
          }
        }
      }
    }
    
    &-sub{
      background:lighten($blue, 10%);
      position: absolute;
      list-style-type: none;
      border-radius: 3px;
      padding: 0px 10px;
      bottom: 380%;
      left: -160%;
      color:#fff;
      display: none;
      
      &:after{
        top: 100%;
        left: 50%;
        border: solid transparent;
        content: " ";
        height: 0;
        width: 0;
        position: absolute;
        pointer-events: none;
        border-color: rgba(0, 151, 167, 0);
        border-top-color:lighten($blue, 10%);
        border-width: 6px;
        margin-left: -6px;
        

      }
      
      & i{
        color: #fff !important;
        padding:5px 10px;
        font-size: 14px !important;
      }
      
      & span{
        padding: 1px 10px;
      }
      
    }
  }
}
!

JS 

              
                $('.not__nav li').on('click', function(){
  $(this).addClass('is-active').siblings().removeClass('is-active');
});
!
999px

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