pinafore/routes/settings/_components/SettingsList.html

<ul>
  <slot></slot>
</ul>
<style>
  ul {
    list-style: none;
    width: 100%;
    border: 1px solid var(--settings-list-item-border);
    margin: 20px auto;
  }

  @media (min-width: 768px) {
    ul {
      max-width: 80%;
    }
  }

</style>