sass: article.scss fixed bug related to theme switching

sass/_article.scss

@@ -4,6 +4,15 @@ body[data-theme="light"] {
     }
 }
 
+
+@media (prefers-color-scheme: light) {
+  body:not([data-theme="black"]) {
+    article > pre {
+        background-color: #f6f7f6 !important;
+    }
+  }
+}
+
 article {
   display: flex;
   padding: 1.5rem;