diff --git a/src/lib/FlySpawner.svelte b/src/lib/FlySpawner.svelte
index 10f7f8c..9e59719 100644
--- a/src/lib/FlySpawner.svelte
+++ b/src/lib/FlySpawner.svelte
@@ -164,18 +164,19 @@
 		will-change: left, top, transform;
 	}
 
-	/* Sprite sheet: 5 frames, each 210x150, total 1050x150 */
+	/* Sprite sheet: 5 frames, each 42px at display size (210px total width).
+	   steps(5) shows frames at: 0, -42, -84, -126, -168px */
 	.fly-sprite {
 		width: 100%;
 		height: 100%;
 		background: url('/fly-sprite.png') 0 0 no-repeat;
-		background-size: 500% 100%; /* 5 frames wide */
-		animation: flap 0.4s steps(5) infinite;
+		background-size: 210px 30px;
+		animation: flap 0.5s steps(5) infinite;
 	}
 
 	@keyframes flap {
-		from { background-position: 0% 0; }
-		to { background-position: 100% 0; }
+		from { background-position: 0 0; }
+		to { background-position: -210px 0; }
 	}
 
 	.splat-img {