404.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />

    <meta name="theme-color" content="#62809c" />
    <meta name="description" content="Page not found" />
    <meta name="author" content="Benjamin Swart" />
    <meta name="keywords" content="404, error" />
    <meta name="application-name" content="High-altitude Balloon Locator" />
    <meta name="color-scheme" content="dark light" />

    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
    <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png" />
    <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png" />
    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png" />

    <title>Page not found | High-altitude Balloon Locator</title>

    <style>
      html,
      body {
        width: 100%;
        height: 100%;
        margin: 0;
      }

      body {
        background-color: black;
        color: white;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
      }

      h1 {
        margin: 0;
        font-size: 25vmin;
        font-family: monospace;
      }
    </style>
  </head>
  <body>
    <h1>404</h1>
  </body>
</html>