<div class="container">
  <div class="rectangle">
    <div class="notification-text">
      <i class="material-icons">info</i>
      <span>&nbsp;&nbsp;This is a test notification.</span>
    </div>
  </div>
</div>

html,
body {
  height: 100%;
}

.container {
  display: flex;
  height: 100%;
  justify-content: center;
  align-items: center;
}

.rectangle {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  positon: relative;
  width: 50px;
  height: 50px;
  background: #380848;
  transform: scale(0);
  border-radius: 50%;
  color: white;
  opacity: 0;
  overflow: hidden;
  animation: scale-in .3s ease-out forwards,
    expand .35s .25s ease-out forwards;
}

.notification-text {
  display: flex;
  align-items: center;
  padding: 0 16px;
  font-family: 'Roboto', sans-serif;
  font-size: 14px;
  animation: fade-in .65s ease-in forwards;
}

@keyframes scale-in {
  100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes expand {
  50% {
    width: 350px;
    border-radius: 6px;
  }
  100% {
    width: 300px;
    border-radius: 4px;
    box-shadow: 0px 1px 3px 0px rgba(0,0,0,.2),
                0px 1px 1px 0px rgba(0,0,0,.14),
                0px 3px 3px -1px rgba(0,0,0,.12);
  }
}

@keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: .8;
  }
}