diff --git a/.changeset/shaky-olives-listen.md b/.changeset/shaky-olives-listen.md
new file mode 100644
index 0000000000..f5ae021d1c
--- /dev/null
+++ b/.changeset/shaky-olives-listen.md
@@ -0,0 +1,6 @@
+---
+"@self/spa": patch
+"gradio": patch
+---
+
+fix:load `theme.css` relatively instead of from `config.root`
diff --git a/js/spa/src/Index.svelte b/js/spa/src/Index.svelte
index 4314ed34db..8b3de83839 100644
--- a/js/spa/src/Index.svelte
+++ b/js/spa/src/Index.svelte
@@ -156,10 +156,7 @@
 				css_text_stylesheet
 			);
 		}
-		await mount_css(
-			config.root + "/theme.css?v=" + config.theme_hash,
-			document.head
-		);
+		await mount_css("./theme.css?v=" + config.theme_hash, document.head);
 		if (!config.stylesheets) return;
 
 		await Promise.all(