<!DOCTYPE html>
<html>
<head>
<style type="text/css">
.container{
display: flex;
flex-flow: row wrap;
font-weight: bold;
text-align: center;
}
.container > *{
padding:10px;
flex:1 100%;
}
.header{
background-color:tomato;
}
.footer{
background-color:lightgreen;
}
.main{
text-align:left;
background-color:deepskyblue;
}
.aside-1{
background-color:gold;
}
.aside-2{
background-color:hotpink;
}
@media all and(min-width:600px){
.aside{
flex:1 auto;
}
}
@media all and(min-width:800px){
.main{
flex:2 0px;
}
.main{
order:2;
}
.aside-1{
order:1;
}
.aside-2{
order:3;
}
.footer{
order:4;
}
}
</style>
</head>
<body>
<div class="container">
<header class="header">Header</header>
<article class="main">
<p>
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</p>
</article>
<aside class="aside aside-1">Aside-1</aside>
<aside class="aside aside-2">Aside-2</aside>
<footer class="footer">Footer<footer>
</div>
</body>
</html>
