diff --git a/sample/a-buffer/composite.wgsl b/sample/a-buffer/composite.wgsl
index 72604372..ff5aadff 100644
--- a/sample/a-buffer/composite.wgsl
+++ b/sample/a-buffer/composite.wgsl
@@ -49,7 +49,7 @@ fn main_fs(@builtin(position) position: vec4f) -> @location(0) vec4f {
   let headsIndex = u32(fragCoords.y - sliceInfo.sliceStartY) * uniforms.targetWidth + u32(fragCoords.x);
 
   // The maximum layers we can process for any pixel
-  const maxLayers = 24u;
+  const maxLayers = 12u;
 
   var layers: array<LinkedListElement, maxLayers>;
 
diff --git a/sample/a-buffer/main.ts b/sample/a-buffer/main.ts
index ede56880..5fdb0281 100644
--- a/sample/a-buffer/main.ts
+++ b/sample/a-buffer/main.ts
@@ -21,7 +21,7 @@ const presentationFormat = navigator.gpu.getPreferredCanvasFormat();
 context.configure({
   device,
   format: presentationFormat,
-  alphaMode: 'premultiplied',
+  alphaMode: 'opaque',
 });
 
 const params = new URLSearchParams(window.location.search);