bug fix

src/App.vue

@@ -1,7 +1,7 @@
 <template>
   <div id="app" v-if="showPage">
     <router-view/>
-    <music :url="activity.Music"></music>
+    <music :url="activity.Music" :theme="theme"></music>
   </div>
 </template>
 
@@ -23,7 +23,8 @@ export default {
   },
   computed: {
     ...mapactivityState({
-      activity: s => s.activity || {}
+      activity: s => s.activity || {},
+      theme: s => `${s.theme}`,
     })
   },
   created() {