<!doctype html>
<html lang="en">
    <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>HTML5 Test Page</title>
        <link rel="stylesheet" href="cosmo.css" />
    </head>
    <body class="u-container">
        <div id="top" role="document">
            <nav style="display: flex; justify-content: end; gap: 1rem">
                <a href="/">Home</a>
                <a href="#menu">Menu ↓</a>
            </nav>
        