<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
:root {
font-size: 62.5%;
}
body {
margin: 0;
font-size: 1.6rem;
}
.header {
font-size: 2.4rem;
padding: 0.8rem;
background-color: lightgreen;
text-align: center;
}
.flex {
display: flex;
}
.sidebar-left {
font-size: 1.8rem;
padding: 0.8rem;
width: 20vw;
background-color: pink;
}
.content-right {
padding: 0.8rem;
background-color: lightblue;
width: 80vw;
}
</style>
</head>
<body>
<div class="main">