diff --git a/client/src/index.css b/client/src/index.css
index 285bc4d..4e82746 100644
--- a/client/src/index.css
+++ b/client/src/index.css
@@ -333,4 +333,20 @@ input[data-testid*="search"]::placeholder {
   user-select: none;
   opacity: 0.08;
   filter: blur(0.5px);
+}
+
+/* Test grid overlay */
+body.show-grid::after {
+  content: '';
+  position: fixed;
+  top: 0;
+  left: 0;
+  width: 100%;
+  height: 100%;
+  pointer-events: none;
+  z-index: 9999;
+  background-image: 
+    linear-gradient(rgba(255, 0, 0, 0.2) 1px, transparent 1px),
+    linear-gradient(90deg, rgba(255, 0, 0, 0.2) 1px, transparent 1px);
+  background-size: 20px 20px;
 }
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