Bootstrap Snippet Dark mode using HTML CSS Javascript

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="container">
    <div class="row">
        <h2>Toggle Dark/Light Mode</h2>
    <p>Click the button to toggle between dark and light mode for this page.</p>
    
    <a onclick="myFunction()">
      <i onclick="myFunction2(this)" class="fa fa-sun-o"></i>
    </a>
    </div>
</div>
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body {
  padding: 25px;
  background-color: white;
  color: black;
  font-size: 25px;
}
h2{
color:#f00;
}
.dark-mode {
  background-color: black;
  color: white;
}
.dark-mode h2{
color:white;
}
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function myFunction() {
   var element = document.body;
   element.classList.toggle("dark-mode");
   element.classList.toggle("dark-mode h2");
}
function myFunction2(x) {
  x.classList.toggle("fa-moon-o");
}
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"Dark mode"
Bootstrap 4.1.1 Snippet by SANTANU CHOWDHURY

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Questions / Comments:

"Dark mode" Bootstrap 4.1.1 Snippet by SANTANU CHOWDHURY

Related: See More

Questions / Comments:

"Dark mode"
Bootstrap 4.1.1 Snippet by SANTANU CHOWDHURY