signin template

<div class="centered-container">
  <form is="iron-form" id="form" method="post" action="/form/handler">
    <paper-card heading="Sign In">
      <div class="card-content">
        <paper-input name="email" label="Email" auto-validate required pattern="[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$" value={{email}}></paper-input>
        <paper-input name="password" label="Password" type="password" auto-validate required value={{password}}></paper-input>
      </div>
      <div class="card-actions">
        <paper-button raised on-click="submitForm">Sign In</paper-button>
      </div>
    </paper-card>
  </form>
</div>