<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>PostCSS Tutorial</title>
    <link rel="stylesheet" href="/build/main.css" />
  </head>
  <body>
    <div class="container">
      <header class="header">header</header>
      <main class="main">main</main>
      <aside class="aside">aside</aside>
      <nav class="nav">nav</nav>
      <foote