apps/web/src/pages/generate/components/FrontendPreviewPlayer.tsx

@@ -343,7 +343,17 @@ const FrontendPreviewPlayer: React.FC<FrontendPreviewPlayerProps> = ({
   }
 
   return (
-    <div style={{ position: "relative", width: "100%", height: "100%" }}>
+    <div
+      style={{
+        position: "relative",
+        width: "100%",
+        height: "100%",
+        minHeight: 400,
+        background: "#000",
+        borderRadius: 8,
+        overflow: "hidden",
+      }}
+    >
       {/* ── Canvas 渲染层（WebCodecs 路径） ── */}
       {effectiveUseWebCodecs && (
         <div

apps/web/src/pages/generate/generate.css

@@ -111,6 +111,7 @@
   grid-template-columns: 1fr 320px;
   gap: 24px;
   align-items: start;
+  min-height: 500px;
 }
 
 /* ============================================================
@@ -2526,6 +2527,8 @@
   display: flex;
   flex-direction: column;
   gap: 16px;
+  height: 100%;
+  min-height: 500px;
 }
 
 .xx-preview-header {