style(StudyDetailPage): 调整播放按钮尺寸以改善视觉效果

@@ -15,7 +15,7 @@
                         <div class="absolute inset-0 flex items-center justify-center cursor-pointer"
                             @click="startPlay">
                             <div
-                                class="w-24 h-24 rounded-full bg-black/50 flex items-center justify-center hover:bg-black/70 transition-colors">
+                                class="w-20 h-20 rounded-full bg-black/50 flex items-center justify-center hover:bg-black/70 transition-colors">
                                 <font-awesome-icon icon="circle-play" class="text-5xl text-white"
                                     style="font-size: 3rem;" />
                             </div>