diff --git a/src/index.html b/src/index.html
index 50f1b7d..4ac15a4 100644
--- a/src/index.html
+++ b/src/index.html
@@ -9,7 +9,7 @@
             box-sizing: border-box;
         }
         body {
-            background-image: url(LAPUTA_WEBP), URL(LAPUTA_SVG);
+            background-image: url(LAPUTA_WEBP), url(LAPUTA_SVG);
             /* todo: revist image-set */
             background-position-x: center;
             background-size: cover;