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CSS

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HTML 

              
                <body id="body"> <!-- body will be the .nav-button target -->
  
<aside class="sidebar">
  <nav id="navigation" role="navigation">
    <a href="#">Salade</a>
    <a href="#">Tomate</a>
    <a href="#">Oignons</a>
    <a href="#">Choucroute</a>
    <a href="#">Picon bière</a>
  </nav>
</aside>
 <!-- /aside -->

<div class="wrapper">
  <a href="#body" class="nav-button-open" aria-label="open navigation"></a>
  <a href="#" class="nav-button-close" aria-label="close navigation"></a>
  <header id="header">
    <h1>Push left CSS Nav</h1>
  </header>

  <div class="main">
    <h2>partie "main"</h2>
    <p>Navigation "off Canvas" basée sur :</p>
    <ul>
      <li>CSS pour la décoration du lien-bouton (via linear-gradients)</li>
      <li>CSS pour l'évément du "touch" (via :target)</li>
      <li>CSS pour la transition</li>
    </ul>
    <p>Le principe général est celui-ci :</p>
    <ul>
      <li>Sur grand écran (mini 768), "sidebar" est simplement placé en haut de "wrapper".</li>
      <li>Sur petit écran (maxi 767), "sidebar" passe en position absolute, "wrapper" est décalé en translation par dessus "sidebar".</li>
    </ul>
    <p>Pré-requis :</p>
    <ul>
      <li>body doit avoir un id pour être ciblé par l'ancre</li>
    </ul>
  </div>

  <footer id="footer">
    <p>Mon <b>footer</b>
    </p>
  </footer>
</div>
<!-- /wrapper -->
  
 </body>
!

CSS 

              
                /* preventing from overflow */
html,
body {
  overflow-x: hidden;
}

/* wrapper styles */
.wrapper {
  position: relative;
  min-height: 100vh;
}

/* small screens styles */
@media (max-width: 767px) {
  .sidebar {
    position: absolute;
    top: 0;
    width: 50vw;
    min-height: 100vh;
  }
  .wrapper {
    transform: translateX(0) translateZ(0);
    transition: transform .2s;
    will-change: transform;
  }

  /* Button deco */
  [class^="nav-button"] {
    display: block;
    z-index: 1;
    height: 3.5rem; width: 3.5rem;
    background-color: transparent;
    background-image: linear-gradient(to right, #333, #333),
      linear-gradient(to right, #333, #333),
      linear-gradient(to right, #333, #333);
    background-position: center top, center, center bottom;
    background-repeat: no-repeat;
    background-size: 3.5rem .9rem;
    padding: 0;
    outline: 0;
    border: 0;
    cursor: pointer;
    -webkit-tap-highlight-color:rgba(0,0,0,0);
  }
  
  /* here's goes the push left effect */
  body:target .wrapper {
    transform: translateX(50vw);
  }
  .nav-button-close,
  body:target .nav-button-open {
    display: none;
  }
  .nav-button-open,
  body:target .nav-button-close {
    display: block;
  }
  
} /* end of small screen media query */

/* Global deco */
* {
  box-sizing: border-box;
}
html {
  font-size: 62.5%;
}
body {
  margin: 0;
  padding: 0;
  color: #fff;
  font-size: 1.6em;
  font-family: arial, sans-serif;
}
a {
  color: #fff;
}
.wrapper {
  padding: 2rem;
  background-color: #eee;
  color: #333;
}
.sidebar {
  padding-top: 1em;
  background: #333;
  color: #ddd;
}
nav a {
  display: block;
  padding: .7em;
  margin-bottom: 2px;
  text-decoration: none;
  background: rgba(255,255,255, 0.1);
}
!

JS
!
999px

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