<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
* {
box-sizing: border-box;
font-size: 18px;
}
body {
display: flex;
flex-direction: column;
min-height: 100vh;
margin: 0;
}
.main {
display: flex;
flex: 1;
}
.main > article {
flex: 1;
}
.main > nav,
.main > aside {
flex: 0 0 20vw;
background: #d5dce8;
}
.main > nav {
order: -1;
}
header,
footer {
background: #1c87c9;
height: 15vh;
}
header,