<div class="scroll-downs">
  <div class="mousey">
    <div class="scroller"></div>
  </div>
</div>
body,html  {
  background-color: #000;
  width: 100%;
  min-height: 100%;
  padding: 0;
  margin: 0;
}
.scroll-downs {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  margin: auto;
  
  width :34px;
  height: 55px;
}
.mousey {
  width: 3px;
  padding: 10px 15px;
  height: 35px;
  border: 2px solid #fff;
  border-radius: 25px;
  opacity: 0.75;
  box-sizing: content-box;
}
.scroller {
  width: 3px;
  height: 10px;
  border-radius: 25%;
  background-color: #fff;
  animation-name: scroll;
  animation-duration: 2.2s;
  animation-timing-function: cubic-bezier(.15,.41,.69,.94);
  animation-iteration-count: infinite;
}
@keyframes scroll {
  0% { opacity: 0; }
  10% { transform: translateY(0); opacity: 1; }
  100% { transform: translateY(15px); opacity: 0;}
}

External CSS

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External JavaScript

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