Update app.py

app.py

@@ -35,7 +35,7 @@ page_bg_img = """
         background-position: 0% 0%;
     }
     25% {
-        background-position: 100% 0%;
+        background-position: 0% 0%;
     }
     50% {
         background-position: 100% 100%;
@@ -44,7 +44,7 @@ page_bg_img = """
         background-position: 100% 100%;
     }
     100% {
-        background-position: 100% 0%;
+        background-position: 0% 0%;
     }
 }