Update app.py

app.py

@@ -64,8 +64,7 @@ custom_css = """
 body {
     background-image: 
         linear-gradient(to right, transparent 39px, #a05252 1px, transparent 40px), /* Vertical dashed lines */
-        linear-gradient(to bottom, transparent 39px, #a05252 1px, transparent 40px); /* Horizontal dashed lines */;
-    background-size: 1200px 1200px; /* Grid cell size */
+    background-size: 1800px 1800px; /* Grid cell size */
     height: 100%; /* Ensure body height is 100% of the viewport */
     margin: 0; /* Remove default margin */
     overflow-y: auto; /* Allow vertical scrolling if needed */