back.html.j2

<style data-teleport="head">
  .back-cover {
    page: last;
    height: 100%;
  }

  .back-cover img {
    top: 0;
    left: 0;
    position: absolute;
  }

  .back-cover section {
    .title {
      color: #fff;
      position: absolute;
      top: 50%;
      left: 0;
      vertical-align: middle;
      font-size: 24pt;
      text-align: center;
      width: 100%;
    }
  }

  @page last {
    margin: 0;
    background: var(--md-primary-fg-color);

    @top-center {
      content: none;
    }

    @bottom-center {
      content: none;
    }
  }
</style>
<div class="back-cover">
  <section>
    <div class="title">{{ config.site_name }}</div>
  </section>
</div>