Style code buttons for dark mode (#3100)

Author: AndreasArvidsson

packages/cursorless-org-docs/src/docs/components/Code.css

@@ -64,3 +64,10 @@
   width: 1.25rem;
   height: 0.75rem;
 }
+
+[data-theme="dark"]:root {
+  .code-copy-button,
+  .code-container > .code-link {
+    background-color: #444;
+  }
+}