append-head.html

<style>
  /* hover 显示原文 */
  p[data-x-en],
  li[data-x-en] {
    position: relative;
  }
  p[data-x-en]:hover::after,
  li[data-x-en]:hover::after {
    visibility: visible;
    opacity: 1;
  }
  p[data-x-en]::after,
  li[data-x-en]::after {
    content: attr(data-x-en);
    display: block;
    font-size: 12px;
    transition: all 0.2s 0.3s;
    visibility: hidden;
    opacity: 0;
    background: #cccccc;
    z-index: 99;
    border-radius: 4px;
    padding: 5px 10px;
    position: absolute;
    top: 100%;
    left: 0;
  }
  /* 译者注释内容 */
  div[type='comment'] {
    border-radius: 4px;
    padding: 5px 10px;
    font-size: 12px;
    background: #eee;
  }
  div[type='comment']::before {
    content: '译者注: ';
    font-weight: 900;
  }
  header a.logo {
    position: relative;
  }
  header a.logo::after {
    content: '中文';
    position: absolute;
    left: calc(100% + 5px);
    font-size: 12px;
    width: 50px;
    top: -5px;
  }
  #banner-info {
    position: fixed;
    top: 0;
    left: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    font-size: 12px;
    padding: 0;
    z-index: 999;
  }
  #add-info {
    font-size: 14px;
  }
  blockquote {
    border-left: 5px solid #ccc;
    padding-left: 10px;
    margin-left: 0;
  }
</style>