hexo-theme-next/source/css/_common/components/post/post-expand.styl

.content {
  padding-top: 40px;
}

.post-body {
  +desktop() {
    text-align: unquote(hexo-config('text_align.desktop'));
  }

  +tablet-mobile() {
    text-align: unquote(hexo-config('text_align.mobile'));
  }

  h1, h2, h3, h4, h5, h6 {
    padding-top: 10px;

    // Supported plugins: hexo-renderer-markdown-it hexo-renderer-marked
    .header-anchor, .headerlink {
      border-bottom-style: none;
      color: inherit;
      float: right;
      font-size: $font-size-small;
      margin-left: 10px;
      opacity: 0;

      &::before {
        font-family-icons('\f0c1');
      }
    }

    &:hover {
      .header-anchor, .headerlink {
        opacity: .5;

        &:hover {
          opacity: 1;
        }
      }
    }
  }

  iframe, img, video {
    margin-bottom: 20px;
  }

  .video-container {
    height: 0;
    margin-bottom: 20px;
    overflow: hidden;
    padding-top: 75%;
    position: relative;
    width: 100%;

    iframe, object, embed {
      height: 100%;
      left: 0;
      margin: 0;
      position: absolute;
      top: 0;
      width: 100%;
    }
  }
}