rambhairao/sidebar.css

## sidebar.css
.button {
    background-color: #4CAF50; /* Green */
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    cursor: pointer;
}
.sidebar{
  background-color: red;
  position: fixed;
  width: 300px;
  top: 100px;
  right: 0px;
  transition: transform 1s ease-in-out;
}
.sidebar li {
  padding-top: 15px;
}
.sidebar.is-hidden{
  transform: translateX(300px);
}

## sidebar.html
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
<style id="jsbin-css">
.button {
    background-color: #4CAF50; /* Green */
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    cursor: pointer;
}
.sidebar{
  background-color: red;
  position: fixed;
  width: 300px;
  top: 100px;
  right: 0px;
  transition: transform 1s ease-in-out;
}
.sidebar li {
  padding-top: 15px;
}
.sidebar.is-hidden{
  transform: translateX(300px);
}
</style>
</head>
<body>
 <div>
   <button class="button"> click me </button>
  </div>
  <div class="sidebar  is-hidden">
    <ul>
      <li> <a href="#" > sidebar 1 </a> </li>
      <li> <a href="#" > sidebar 2 </a> </li>
      <li> <a href="#" > sidebar 3 </a> </li>
      <li> <a href="#" > sidebar 4 </a> </li>
      <li> <a href="#" > sidebar 5 </a> </li>
    </ul>

  </div>
<script id="jsbin-javascript">
var press = document.querySelector('.button');
var side  = document.querySelector('.sidebar');


press.addEventListener('click', function(){
  if(side.classList.contains("is-hidden")){
    side.classList.remove("is-hidden");
  } else {
    side.classList.add('is-hidden');
  }
})
</script>


<script id="jsbin-source-css" type="text/css">.button {
    background-color: #4CAF50; /* Green */
    border: none;
    color: white;
    padding: 15px 32px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
    cursor: pointer;
}
.sidebar{
  background-color: red;
  position: fixed;
  width: 300px;
  top: 100px;
  right: 0px;
  transition: transform 1s ease-in-out;
}
.sidebar li {
  padding-top: 15px;
}
.sidebar.is-hidden{
  transform: translateX(300px);
}
</script>

<script id="jsbin-source-javascript" type="text/javascript">var press = document.querySelector('.button');
var side  = document.querySelector('.sidebar');


press.addEventListener('click', function(){
  if(side.classList.contains("is-hidden")){
    side.classList.remove("is-hidden");
  } else {
    side.classList.add('is-hidden');
  }
})</script></body>
</html>

## sidebar.js
var press = document.querySelector('.button');
var side  = document.querySelector('.sidebar');


press.addEventListener('click', function(){
  if(side.classList.contains("is-hidden")){
    side.classList.remove("is-hidden");
  } else {
    side.classList.add('is-hidden');
  }
})