captchas/layout.tmpl

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css">
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script>
    <title>CleverGo Captchas</title>
    <style>
      body {
        margin-top: 80px;
      }
      form img {
        max-height: 60px;
      }
    </style>
  </head>
  <body>
    <header>
        <nav class="navbar navbar-expand-lg fixed-top navbar-dark bg-dark">
            <a class="navbar-brand" href="/">CleverGo Captchas</a>
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
              <span class="navbar-toggler-icon"></span>
            </button>
          
            <div class="collapse navbar-collapse" id="navbarSupportedContent">
              <ul class="navbar-nav mr-auto">
                <li class="nav-item">
                  <a class="nav-link" href="/?driver=digit">Digit</a>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="/?driver=audio">Audio</a>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="/?driver=math">Math</a>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="/?driver=string">String</a>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="/?driver=chinese">Chinese</a>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="/api">API</a>
                </li>
                <li class="nav-item">
                  <a class="nav-link" href="https://github.com/clevergo/captchas" target="_blank">GitHub</a>
                </li>
            </div>
          </nav>
    </header>

    <main class="container">
        {{ template "content" . }}
    </main>
  </body>
</html>