<!-- this script is provided by https://www.javascriptfreecode.com coded by: Kerixa Inc. -->
<link rel='stylesheet' href='https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css'>
<style>
@import url("https://fonts.googleapis.com/css?family=Source+Sans+Pro:400,700");
* {
  margin: 0;
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}

html, body {
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}

body {
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  font-family: 'Source Sans Pro', sans-serif;
}

.buttons-container {
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  width: 395px;
  height: 100px;
  border-radius: 45px;
  background: #151515;
  box-shadow: inset 0 0 2px 2px rgba(0, 0, 0, 0.5);
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ul {
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}
ul li {
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  margin: 1px;
  height: 90px;
  width: 95px;
  background: #202020;
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  box-shadow: 0 15px 20px 0 rgba(0, 0, 0, 0.5);
  transition: all .5s;
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ul li:nth-of-type(1) {
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ul li:last-of-type {
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ul li:hover {
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}
ul li a {
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  font-size: 40px;
  transition: all .5s;
}

.created-by {
  position: absolute;
  margin: auto;
  left: 0;
  right: 0;
  bottom: 10%;
  width: 200px;
  text-align: center;
  font-size: 10px;
  letter-spacing: 0.5em;
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}
.created-by p {
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}
.created-by a {
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  text-shadow: 0 0 15px rgba(244, 0, 0, 0.71);
  text-decoration: none;
  font-weight: 700;
}
.created-by a:hover {
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.active {
  background: #151515;
  border-top: none;
  border-bottom: 1px solid #252525;
  box-shadow: inset 0 0 10px 1px rgba(0, 0, 0, 0.8);
}

.active-text {
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  text-shadow: 0 0 15px rgba(220, 10, 10, 0.5);
}
</style>
<div class="buttons-container">
<ul>
<li class="active"><a href="#" class="active-text"><i class="fa fa-codepen" aria-hidden="true"></i></a></li>
<li><a href="#"><i class="fa fa-coffee" aria-hidden="true"></i></a></li>
<li><a href="#"><i class="fa fa-rocket" aria-hidden="true"></i></a></li>
<li><a href="#"><i class="fa fa-user-circle" aria-hidden="true"></i></a></li>
</ul>
</div>

<script>
const lis = document.querySelectorAll("li");
const a = document.querySelectorAll("li a");

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