Update app.py

app.py

@@ -64,8 +64,8 @@ custom_css = """
 body {
     background-color: #800000; /* Maroon background */
     background-image: 
-        linear-gradient(to right, #a05252 10px, transparent 10px), /* Vertical dashed lines */
-        linear-gradient(to bottom, #a05252 10px, transparent 10px); /* Horizontal dashed lines */
+        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: 80px 80px; /* Grid cell size */
     height: 100%; /* Ensure body height is 100% of the viewport */
     margin: 0; /* Remove default margin */