diff --git a/source/css/_common/scaffolding/highlight/index.styl b/source/css/_common/scaffolding/highlight/index.styl
index 250067a..3c3c6e9 100644
--- a/source/css/_common/scaffolding/highlight/index.styl
+++ b/source/css/_common/scaffolding/highlight/index.styl
@@ -109,6 +109,11 @@ figure.highlight {
     padding-left: 10px;
     width: 100%;
   }
+
+  // See https://github.com/next-theme/hexo-theme-next/discussions/410
+  .marked {
+    background: rgba(0, 0, 0, .3);
+  }
 }
 
 // See https://github.com/hexojs/hexo-util/pull/229