diff --git a/app/expo/page.tsx b/app/expo/page.tsx
index b8b7075..3ede32f 100644
--- a/app/expo/page.tsx
+++ b/app/expo/page.tsx
@@ -127,7 +127,7 @@ export default function ExpoPage() {
       {/* 全屏按钮 */}
       <button
         onClick={toggleFs}
-        className="fixed z-[60] top-2 left-2 md:top-3 md:left-3 w-9 h-9 md:w-10 md:h-10 flex items-center justify-center rounded-full bg-black/60 hover:bg-black/80 border border-white/10 text-slate-200 backdrop-blur-sm transition"
+        className="fixed z-[60] top-2 right-2 md:top-3 md:right-3 w-9 h-9 md:w-10 md:h-10 flex items-center justify-center rounded-full bg-black/60 hover:bg-black/80 border border-white/10 text-slate-200 backdrop-blur-sm transition"
         aria-label={isFullscreen ? "退出全屏" : "进入全屏"}
       >
         {isFullscreen ? <Minimize2 className="w-4 h-4 md:w-5 md:h-5" /> : <Maximize2 className="w-4 h-4 md:w-5 md:h-5" />}
diff --git a/public/videos/circuit.mp4 b/public/videos/circuit.mp4
new file mode 100644
index 0000000..77bb3f7
Binary files /dev/null and b/public/videos/circuit.mp4 differ
diff --git a/public/videos/electromag.mp4 b/public/videos/electromag.mp4
index c9907d6..ac53fd6 100644
Binary files a/public/videos/electromag.mp4 and b/public/videos/electromag.mp4 differ