Side bar

<button id="menu-toggle"></button>
<nav id="menu" role="navigation">
  <div class="brand">&Aopf;</div>            
  <ul>
    <li><a href="#">Item 1</a></li>
    <li><a href="#">Item 2</a></li>
    <li><a href="#">Item 3</a></li>
  </ul>
</nav>
<div class="page-wrap">
  <div class="container" role="main">
    <article>
      <h2>Vanilla Javascript push menu</h2>
      <p>Sometimes you just need a really simple push menu, without any Javascript Libraries. I made this in a rush for a client with the instructions to not use any jQuery.</p>
      <p>I like the thought of adding a class to the body and climb the DOM instead of adding classes to the affected elements.</p>
      <p>Less is more.</p>
    </article>
  </div>
</div>
//Автор: Nikolay Talanov. @suez

html, body {
  height: 100%;
  overflow: hidden;
}
body {
  width: 100%;
  margin: 0;

  font-family: "Roboto", sans-serif;

  color: #fff;
  background-color: #232629;
}

p {
  line-height: 1.7;
}
h2 {
  margin-top: 30px;

  font-size: 1.7em;
  line-height: 1;

  letter-spacing: 2px;
  text-transform: uppercase;
}
/* PUSH MENU */
#menu {
  position: absolute;
  top: 0;
  left: -300px;

  width: 300px;
  height: 100%;
  padding: 50px 30px;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;

  -webkit-transition: all .3s ease-in;
  -moz-transition: all .3s ease-in;
  -o-transition: all .3s ease-in;
  transition: all .3s ease-in;
  text-align: center;

  background-color: #fff;
  /*transform: translateX(-300px);*/
}
#menu .brand {
  height: 51px;

  font-size: 70px;
  font-weight: 900;
  line-height: .6;

  color: #ddd;
}
#menu ul {
  padding: 0;
  margin-top: 30px;
}

#menu ul li a {
  display: block;

  font-weight: 900;
  line-height: 50px;

  -webkit-transition: all .3s ease;
  -moz-transition: all .3s ease;
  -o-transition: all .3s ease;
  transition: all .3s ease;
  text-decoration: none;
  text-transform: uppercase;

  color: #232629;
  border-top: 1px solid #eee;
}
#menu ul li:last-child a {
  border-bottom: 1px solid #eee;
}
#menu ul li a:hover {
  letter-spacing: 1px;
}
/* MAIN PAGE */
.page-wrap {

  padding: 50px;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;

  -webkit-transition: all .3s ease-in;
  -moz-transition: all .3s ease-in;
  -o-transition: all .3s ease-in;
  transition: all .3s ease-in;
}

/* MENU TOGGLE ICON */

button:focus {
  outline: none;
}
#menu-toggle {
  position: absolute;
  top: 50px;
  left: 50px;

  width: 51px;
  height: 51px;

  cursor: pointer;

  border: none;
  -webkit-border-radius: 50px;
  -moz-border-radius: 50px;
  border-radius: 50px;
  background: #fff;
  transition: all 0.3s ease-in;
}
#menu-toggle:focus {
  z-index: -10;
  transform: translateX(300px);
}
#menu-toggle:focus ~ .page-wrap {
  transform: translateX(300px);
}
#menu-toggle:focus ~ #menu {
  transform: translateX(300px);
  /*left: 0;*/
}
#menu-toggle:before,
#menu-toggle:after {
  position: absolute;

  content: "";
  content: "";
  -webkit-transition: all .5s ease;
  -moz-transition: all .5s ease;
  -o-transition: all .5s ease;
  transition: all .5s ease;

  background-color: #232629;
}

#menu-toggle:before {
  top: 12px;
  left: 25px;

  width: 1px;
  height: 27px;
}
#menu-toggle:after {
  top: 25px;
  left: 12px;

  width: 27px;
  height: 1px;
}

#menu-toggle:focus:before,
#menu-toggle:focus:after {
  -webkit-transform: rotate(45deg);
  -ms-transform: rotate(45deg);
  transform: rotate(45deg);
}
/* CONTENT CONTAINER */
.container {
  max-width: 600px;
  min-width: 200px;
  margin: 0 auto;
}