blog-ruoyi/blog-web-static/styles/dark.scss

.dark {
  .blog-body {
    background-color: #0f172a;

    .bg-blur {
      background-color: rgba(31, 27, 36, .8);
    }

    .card {
      background-color: #0c1222;
    }

    .main-wrap {
      .article-detail {
        .typography {
          color: #ddd;
        }
      }

      .comment-list {
        .comment-text {
          background-color: #212529 !important;
        }
      }
    }
  }
}