{{define "navbar"}}
<nav>
  <ul class="navbar-nav">
    <li class="nav-item">
      <a class="nav-link" href="/">Home</a>
    </li>
  </ul>
</nav>
{{end}}

{{define "body"}}
<div class="container d-flex flex-grow-1 justify-content-center align-items-center flex-column">
  <div class="alert alert-danger" role="alert">
    <p class="mb-0">{{.Message}}</p>
  </div>
</div>
{{end}}