<link href='https://fonts.googleapis.com/css?family=Roboto:400,700' rel='stylesheet' type='text/css'>

<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">

<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>

body {

  font-family: 'Roboto', sans-serif;

  -webkit-font-smoothing: antialiased;

  height: 100vh;

}

section {

  background: #01cfa9;

  height: 100vh;

  margin: 0 auto;

  display: -webkit-box;

  display: -webkit-flex;

  display: -ms-flexbox;

  display: box;

  display: flex;

  -webkit-box-pack: center;

  -o-box-pack: center;

  -ms-flex-pack: center;

  -webkit-justify-content: center;

  justify-content: center;

  -webkit-box-align: center;

  -o-box-align: center;

  -ms-flex-align: center;

  -webkit-align-items: center;

  align-items: center;

}

.section-notification .nav {

  display: -webkit-box;

  display: -webkit-flex;

  display: -ms-flexbox;

  display: box;

  display: flex;

  background: #fff;

  color: #333;

  border-radius: 5px;

  box-shadow: 0px 23px 30px -20px rgba(0,0,0,0.3);

  padding: 0;

}

.section-notification .nav > li {

  padding: 20px 30px;

  width: 24px;

  height: 24px;

  cursor: pointer;

  list-style: none;

  color: rgba(0,0,0,0.5);

  position: relative;

  -webkit-perspective: 1000px;

  -ms-perspective: 1000px;

  perspective: 1000px;

}

.section-notification .nav > li:hover {

  background: #eee;

}

.section-notification .nav > li.is-active {

  box-shadow: 0px -7px 0px #05a285 inset;

  background: #dfdfdf;

  color: #333;

  -webkit-transition: 0.3s ease;

  transition: 0.3s ease;

}

.section-notification .nav > li.is-active .notifications {

  display: -webkit-box;

  display: -webkit-flex;

  display: -ms-flexbox;

  display: box;

  display: flex;

  -webkit-animation: note 0.7s ease-in-out forwards;

  animation: note 0.7s ease-in-out forwards;

  -webkit-transform-origin: center 60px;

  transform-origin: center 60px;

}

@-webkit-keyframes note {

  0% {

    opacity: 0;

    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";

    filter: alpha(opacity=0);

    -webkit-transform: scale(0.1) rotate(30deg) translateY(50px);

    transform: scale(0.1) rotate(30deg) translateY(50px);

  }

  50% {

    -webkit-transform: rotate(-10deg);

    transform: rotate(-10deg);

    opacity: 1;

    -ms-filter: none;

    -webkit-filter: none;

            filter: none;

  }

  70% {

    -webkit-transform: rotate(5deg);

    transform: rotate(5deg);

  }

  100% {

    -webkit-transform: scale(1);

    transform: scale(1);

  }

}

@keyframes note {

  0% {

    opacity: 0;

    -ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";

    filter: alpha(opacity=0);

    -webkit-transform: scale(0.1) rotate(30deg) translateY(50px);

    transform: scale(0.1) rotate(30deg) translateY(50px);

  }

  50% {

    -webkit-transform: rotate(-10deg);

    transform: rotate(-10deg);

    opacity: 1;

    -ms-filter: none;

    -webkit-filter: none;

            filter: none;

  }

  70% {

    -webkit-transform: rotate(5deg);

    transform: rotate(5deg);

  }

  100% {

    -webkit-transform: scale(1);

    transform: scale(1);

  }

}

.section-notification .notifications {

  list-style: none;

  background: #05a285;

  display: none;

  border-radius: 4px;

  position: absolute;

  bottom: 100%;

  left: 50%;

  padding: 0px 10px;

  margin: 0 0 10px -88px;

  cursor: default;

  color: #fff;

}

.section-notification .notifications:after {

  position: absolute;

  top: 100%;

  left: 50%;

  border: solid transparent;

  content: " ";

  height: 0;

  width: 0;

  border-top-color: #05a285;

  border-width: 16px;

  margin-left: -16px;

  pointer-events: none;

}

.section-notification li {

  padding: 6px;

  font-family: 'Roboto', sans-serif;

  color: #fff;

  font-size: 0.6em;

}

.section-notification li .material-icons {

  font-size: 24px;

}

.section-notification li span {

  display: inline-block;

  vertical-align: top;

  margin: 4px;

}

​

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";

  });

}