Fix disqus background in dark mode. (#732)

XiaoTian

28.53.2022 9f7ec4f706e7d0ff4997dc692b368ebc9516a5ba

 exampleSite/resources/_gen/assets/scss/scss/coder.scss_fd4b5b3f9a48bc0c7f005d2f7a4cc30f.content

@@ -3050,6 +3050,9 @@
    body {
      font-size: 1.6em;
      line-height: 1.6em; } }
iframe[src*=disqus] {
  color-scheme: light; }

a {
  font-weight: 500;
  color: #1565c0;