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<div class="flex-container">

<nav class="nav">
  <li><a href="#">Menu1</a></li>
  <li><a href="#">Menu2</a></li>
  <li><a href="#">Menu3</a></li>

<article class="article">
  <h1>Lorem ipsum</h1>
  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Donec elementum vehicula magna, sit amet accumsan nulla tristique vel. Quisque sed sapien quam. Phasellus sed elit faucibus, bibendum libero at, scelerisque nisi. Phasellus luctus, sem sed rutrum auctor, velit ipsum porta nibh, nec vestibulum mi turpis eu ligula. Integer pulvinar neque magna, vel ullamcorper nibh semper vel. Proin ullamcorper vestibulum leo et dignissim. Proin faucibus in lorem porttitor interdum. Praesent pellentesque maximus nibh, vitae pretium elit tincidunt sit amet. Donec malesuada vitae elit vel eleifend. Fusce viverra urna in dolor venenatis venenatis. Praesent tincidunt quam nisl, ac luctus sem mollis non. Nunc sit amet elementum sem. Suspendisse potenti.</p>



              .flex-container {
    display: -webkit-flex;
    display: flex;
    -webkit-flex-flow: row wrap;
    flex-flow: row wrap;
    text-align: center;

.flex-container > * {
    padding: 15px;
    -webkit-flex: 1 100%;
    flex: 1 100%;

.article {
    text-align: left;

.nav {background:#eee;}

.nav ul {
    list-style-type: none;
 padding: 0;
.nav ul a {
 text-decoration: none;

@media all and (min-width: 768px) {
    .nav {text-align:left;-webkit-flex: 1 auto;flex:1 auto;-webkit-order:1;order:1;}
    .article {-webkit-flex:5 0px;flex:5 0px;-webkit-order:2;order:2;}
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