{% if error %}
  <p style="color:red">{{ error }}</p>
{% endif %}

<table>
 <caption>Вход</caption>
 <form method="post">
   <tr><th><label>Email:</th><td><input type="email" name="mail" required></label></td></tr>
   <tr><th><label>Пароль:</th><td><input type="password" name="password" required></label></td></tr>
   <tr><th colspan="2"><button type="submit">Войти</button></th></tr>
 </form>
</table>

<hr>Нет учетки: <a href="/register">Зарегистрироваться</a>