build_files/theme/css/theme_overrides.css

@@ -174,6 +174,11 @@ a[href^="#fig-"]::after {
 	content: "\201d";
 }
 
+/* Mark external links. */
+a.external:not(figure > a.external) {
+	filter: brightness(150%);
+}
+
 /* List blender.org as internal. */
 .external[href^="https://www.blender.org"],
 .external[href^="https://docs.blender.org"],