Drupal 8和样式表

Question

Drupal 8不会渲染我的样式表。有什么想法为什么不能渲染？

我尝试清除缓存，但这没有帮助。下面是我的代码：

fluffiness.info.yml

name: fluffiness
type: theme
description: "A cuddly theme that offers extra fluffiness"
core: 8.x
libraries:
  -fluffiness/cuddly-slider
base them: classy
regions:
  header: Header
  content: Content
  sidebar_first: 'Sidebar first'
  footer: Footer

fluffiness.libraries.yml

cuddly-slider:
  version: 1.x
  css:
    theme:
      css/cuddly-slider.css: {}
  js:
    js/cuddly-slider.js: {}
  dependencies:
    - core/jquery

themes / custom / fluffiness / page--front.html.twig

{{ attach_library('fluffiness/cuddly-slider') }}
<header role="banner">
    {{ page.header }}
</header>
<div class="layout-container">

  <main role="main">
    <a id="main-s" tabindex="-1"></a>{# link is in html.html.twig #}

    <div class="layout-content">
      {{ page.content }}
    </div>{# /.layout-content #}


  </main>

  {% if page.footer %}
    <footer role="contentinfo">
      {{ page.footer }}
    </footer>
  {% endif %}

</div>

themes / custom / fluffiness / css / cuddly-slider.css

header {
    background-color: black;
}