webapi-eca/webpages/handlers/templates/login.html

<div class="error">{{{message}}}</div>
<table>
  <tr>
    <td>username: </td>
    <td><input type="text" id="username" autofocus /></td>
  </tr>
  <tr>
    <td>password: </td>
    <td><input type="password" id="password" /></td>
  </tr>
</table>
<button id="but_submit">login</button>