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HTML

              
                <section class="section-notification">
  <ul class="nav">
    <li><i class="material-icons">home</i>
    </li>
    <li><i class="material-icons">search</i>
    </li>
    <li class="is-active"><i class="material-icons">star
        <ul class="notifications">
          <li><i class="material-icons">remove_red_eye</i><span>9</span>
          </li>
          <li><i class="material-icons">comment</i><span>4</span>
          </li>
          <li><i class="material-icons">account_circle</i><span>6</span>
          </li>
        </ul></i>
    </li>
    <li><i class="material-icons">face</i>
    </li>
  </ul>
</section>
   
              
            
!

CSS

              
                @import 'nib'

greenlight = #01cfa9

flex(n)
  display: n

font()
  font-family 'Roboto',sans-serif

body
  font()
  font-smoothing antialiased
  height 100vh
  
section
  background greenlight
  height 100vh
  margin 0 auto
  flex(flex)
  justify-content center
  align-items center
  
.section-notification
    .nav
      flex(flex)
      background #fff
      color #333
      border-radius 5px
      box-shadow 0px 23px 30px -20px rgba(black, .3)
      padding 0
      
    .nav > li
        padding 20px 30px
        width 24px
        height @width
        cursor pointer
        list-style none
        color rgba(black, .5)
        relative()
        perspective 1000px
        
        &:last-child
          //border-right none
        &:hover
          background #eee
          
        &.is-active
          box-shadow 0px -7px 0px #05a285 inset
          background #dfdfdf
          color #333
          transition .3s ease
          
          .notifications
              flex(flex)
              animation note .7s ease-in-out forwards
              transform-origin center 60px

              @keyframes note
                0%
                  opacity 0
                  transform scale(.1) rotate(30deg) translateY(50px)
                  rotateX(90deg)
                50%
                  transform rotate(-10deg)
                  opacity 1
                70%
                  transform rotate(5deg)
                100%
                  transform scale(1)
            
     .notifications
        list-style none 
        background #05a285
        flex(none)
        border-radius 4px
        absolute bottom 100% left 50%
        padding 0px 10px
        margin 0 0 10px -88px
        cursor default
        color white

        &:after
          absolute top 100% left 50%
          border solid transparent
          content " "
          height 0
          width @height
          border-top-color #05a285
          border-width 16px
          margin-left -16px
          pointer-events none

       li
        padding 6px
        font()
        color white
        font-size .6em

        .material-icons
          font-size 24px

        span
          display inline-block
          vertical-align top
          margin 4px
        
      
              
            
!

JS

              
                var elems =document.getElementsByClassName("nav")[0].getElementsByTagName("li");
for (var i = 0; i < elems.length; i++) {
        elems[i].addEventListener("click", function (e) {
                for (var i = 0; i < elems.length; i++) {
                    elems[i].className="";
                };
                this.className = "is-active";
        });
}
              
            
!
999px

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