diff --git a/plugin/contents/ui/dancer.html b/plugin/contents/ui/dancer.html
index 8fe137a..169f8bc 100644
--- a/plugin/contents/ui/dancer.html
+++ b/plugin/contents/ui/dancer.html
@@ -1590,13 +1590,14 @@ let lastProjMs = -Infinity;
 function projectSky() {
   const W = canvas.width, H = canvas.height;
   if (!W || !H) return;
-  if (renderCanvas.width !== W || renderCanvas.height !== H) {
+  const horizonPx = H * HORIZON_F;
+  const bufferH = Math.ceil(Math.min(H, horizonPx * 1.05));
+  if (renderCanvas.width !== W || renderCanvas.height !== bufferH) {
     renderCanvas.width = W;
-    renderCanvas.height = H;
+    renderCanvas.height = bufferH;
   }
   const bctx = renderCanvas.getContext('2d');
-  bctx.clearRect(0, 0, W, H);
-  const horizonPx = H * HORIZON_F;
+  bctx.clearRect(0, 0, W, bufferH);
   const lst       = localSiderealDeg(Date.now() + window.__skyTimeOffset);
   const glareOn   = !document.body.classList.contains('balada') &&
                     !document.body.classList.contains('chuva');
@@ -1687,8 +1688,8 @@ function drawStars(ts) {
   ctx.clearRect(0, 0, canvas.width, canvas.height);
   const transition = Math.max(0, Math.min(1,
     (ts - skyTransitionStart) / SKY_TRANSITION_MS));
-  if (transition < 1 && previousBaseCanvas.width === canvas.width &&
-      previousBaseCanvas.height === canvas.height) {
+  if (transition < 1 && previousBaseCanvas.width === baseCanvas.width &&
+      previousBaseCanvas.height === baseCanvas.height) {
     const blend = transition * transition * (3 - 2 * transition);
     ctx.globalAlpha = 1 - blend;
     ctx.drawImage(previousBaseCanvas, 0, 0);