diff --git a/src/lib/components/CanvasView.svelte b/src/lib/components/CanvasView.svelte
index d401e9b..0cfdd1f 100644
--- a/src/lib/components/CanvasView.svelte
+++ b/src/lib/components/CanvasView.svelte
@@ -28,11 +28,11 @@
 	let stage: HTMLDivElement;
 	const cssVars = pageCssVars();
 
-	// Background grid: world-anchored, stepping up ×4 when zoomed out so lines never get denser than ~12px.
-	const gridStep = $derived.by(() => {
-		let step = 24 * viewport.scale;
-		while (step < 12) step *= 4;
-		return step;
+	// Background grid: one cell per active page, aligned to its edges (A4 at the origin if none).
+	const grid = $derived.by(() => {
+		const r = (doc.activeId && doc.rects.get(doc.activeId)) || { x: 0, y: 0, ...A4 };
+		const s = viewport.scale;
+		return { w: r.width * s, h: r.height * s, x: viewport.x + r.x * s, y: viewport.y + r.y * s };
 	});
 
 	// ---- autosave --------------------------------------------------------
@@ -529,7 +529,7 @@
 		class:panning
 		class:erasing={tools.tool === 'eraser'}
 		bind:this={stage}
-		style="--grid: {gridStep}px; background-position: {viewport.x}px {viewport.y}px"
+		style="background-size: {grid.w}px {grid.h}px; background-position: {grid.x}px {grid.y}px"
 		onpointerdown={onPointerDown}
 		onpointermove={onPointerMove}
 		onpointerup={onPointerUp}
@@ -672,7 +672,6 @@
 		background-image:
 			linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
 			linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
-		background-size: var(--grid) var(--grid);
 	}
 	.stage :global(.cm-content) {
 		user-select: text;