diff --git a/src/lib/BackgroundGrid.svelte b/src/lib/BackgroundGrid.svelte
index 6f2e438..51bbdea 100644
--- a/src/lib/BackgroundGrid.svelte
+++ b/src/lib/BackgroundGrid.svelte
@@ -111,9 +111,9 @@
 	</div>
 	<div class="grid">
 		{#each [...Array(verticalCount).keys()] as x}
-			<div class="row">
+			<div class="row" data-idx="{x}">
 				{#each [...Array(horizontalCount).keys()] as y}
-					<div class="block"></div>
+					<div class="block" data-idx="{y}"></div>
 				{/each}
 			</div>
 		{/each}