<div class="container">
  <div class="notification">
    <a v-on:click="show = !show" class="tooltip-bell">
      <i class="far fa-2x fa-bell"></i>
      <span id="circle"></span>
    </a>
    <transition name="fadeStart" v-cloak>
      <div v-if="show" class="tooltip">
        <div id="heading">
          <div class="heading-left">
            <h6 class="heading-title">Notifications</h6>
          </div>
          <div class="heading-right">
            <a class="notification-link" href="#">See all</a>
          </div>
        </div>
        <ul class="notification-list">
          <li class="notification-item" v-for="user of users">
            <div class="img-left">
              <img class="user-photo" alt="User Photo" v-bind:src="user.picture.thumbnail" />
            </div>
            <div class="user-content">
              <p class="user-info"><span class="name">{{user.name.first | capitalize}} {{user.name.last | capitalize}}</span> left a comment.</p>
              <p class="time">1 hour ago</p>
            </div>
          </li>
        </ul>
      </div>
    </transition>
  </div>
</div>
@import url('https://fonts.googleapis.com/css?family=Roboto:400,500');

* {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  &:before, &:after {
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
  }
}

body {
  font-family: 'Roboto', sans-serif;
  font-weight: 400;
  background: #f0edf0;
  font-size: 0.875rem;
  min-height: 100vh;
  margin: 0;
  line-height: 1.5;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -ms-flex-align: center;
  align-items: center;
  -webkit-box-pack: center;
  -ms-flex-pack: center;
  justify-content: center;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-gap: 0.625rem;
  grid-template-areas: ". main main ." ". main main .";
  overflow: hidden;
}

.container {
  width: 20rem;
  height: 20rem;
  grid-area: main;
  -ms-flex-item-align: center;
  align-self: center;
  justify-self: center;
}

h2 {
  font-size: 1.6rem;
  font-weight: 400;
  line-height: 2rem;
  color: #1f2022;
}

ul {
  list-style-type: none;
  padding: 0.5rem 1rem;
  margin: 0 0 0.5rem;
}

li {
  display: inline-block;
  padding: 0.85rem 1rem;
  color: #1f2022;
}

h6 {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.1;
  margin: 0.45rem 0;
}

a {
  color: #4aaee7;
  background: transparent;
  outline: 0;
  text-decoration: none;
  cursor: pointer;
}

.notification {
  position: absolute;
}

.tooltip-bell {
  position: absolute;
  display: block;
  left: 9rem;
  color: #a5a6a8;
}

.tooltip {
  &::before {
    content: '';
    position: absolute;
    top: -0.4rem;
    right: 8.3rem;
    border-left: 2rem solid transparent;
    border-right: 2rem solid transparent;
    border-bottom: 1.5rem solid #fff;
  }
  position: absolute;
  top: 2.5rem;
  line-height: 1.5;
  color: #27303d;
  width: 20rem;
  background: #fff;
  border-radius: 5px;
  -webkit-box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.1);
  box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.1);
}

#circle {
  position: absolute;
  top: 0;
  left: 0.75rem;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 100%;
  background: #f07379;
}

.notification-item {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: start;
  -ms-flex-align: start;
  align-items: flex-start;
  display: -ms-grid;
  display: grid;
  padding: 0.65rem 0;
}

#heading {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: start;
  -ms-flex-align: start;
  align-items: flex-start;
  display: -ms-grid;
  display: grid;
  padding: 0.5rem 1rem;
  border-bottom: 0.01rem solid #eee;
}

.notification-link {
  position: absolute;
  margin: 0.4rem 0;
}

.heading-left, .img-left {
  -ms-flex-preferred-size: auto;
  flex-basis: auto;
  -webkit-box-flex: 0;
  -ms-flex-positive: 0;
  flex-grow: 0;
  -ms-flex-negative: 0;
  flex-shrink: 0;
  -ms-grid-row: 1;
  grid-row: 1;
  margin: 0 1rem 0 0;
}

.heading-left, .user-content {
  grid-column: span 9;
  width: 14rem;
}

.heading-right, .img-left {
  grid-column: auto;
}

.heading-right, .user-content {
  -ms-flex-preferred-size: auto;
  flex-basis: auto;
  -webkit-box-flex: 1;
  -ms-flex-positive: 1;
  flex-grow: 1;
  -ms-flex-negative: 1;
  flex-shrink: 1;
  -ms-grid-row: 1;
  grid-row: 1;
}

.heading-right {
  width: 2.5rem;
}

.img-left {
  width: 3rem;
}

.user-photo {
  display: inline-block;
  vertical-align: middle;
  height: 3rem;
  width: 3rem;
  margin: 0 0.5rem 0 0;
  border-radius: 50%;
  max-width: 100%;
}

p {
  &.user-info {
    margin: 0.15rem 0 0;
  }
  &.time {
    margin: 0;
    color: #9da4ae;
  }
}

span.name {
  font-weight: 500;
}

.fadeStart-enter-active {
  -webkit-animation: fadeStart .2s both ease-in-out;
  animation: fadeStart .2s both ease-in-out;
}

.fadeStart-leave-active {
  -webkit-animation: fadeEnd .2s both ease-in-out;
  animation: fadeEnd .2s both ease-in-out;
}

[v-cloak] > * {
  display: none;
}

@-webkit-keyframes fadeStart {
  0% {
    opacity: 0;
    -webkit-transform: translate3d(0, 5px, 0);
    transform: translate3d(0, 5px, 0);
  }

  to {
    opacity: 1;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    display: block;
  }
}


@keyframes fadeStart {
  0% {
    opacity: 0;
    -webkit-transform: translate3d(0, 5px, 0);
    transform: translate3d(0, 5px, 0);
  }

  to {
    opacity: 1;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    display: block;
  }
}


@-webkit-keyframes fadeEnd {
  0% {
    opacity: 1;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
  }

  to {
    opacity: 0;
    -webkit-transform: translate3d(0, 5px, 0);
    transform: translate3d(0, 5px, 0);
  }
}


@keyframes fadeEnd {
  0% {
    opacity: 1;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
  }

  to {
    opacity: 0;
    -webkit-transform: translate3d(0, 5px, 0);
    transform: translate3d(0, 5px, 0);
  }
}
View Compiled
new Vue ({
  el: '.container',
  data: () => ({
    users: [],
    errors: [],
    show: true
  }),

  mounted () {
    this.getUsers()
  },

  methods: {
    getUsers () {
      axios.get('https://randomuser.me/api/?results=3')
        .then(response => {
          console.log(JSON.stringify(response.data.results))
          this.users = response.data.results
        })
        .catch(e => {
          this.errors.push(e)
        })
    }
  },

  filters: {
    capitalize: function (value) {
      if (!value) return ''
      value = value.toString()
      return value.charAt(0).toUpperCase() + value.slice(1)
    }
  }
});
View Compiled
Run Pen

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

  1. https://unpkg.com/vue
  2. https://unpkg.com/axios/dist/axios.min.js
  3. https://use.fontawesome.com/releases/v5.0.4/js/all.js