improve demo component

src/demos/Time/index.vue

@@ -1,14 +1,17 @@
 <template>
   <div>
-    Time: {{ new Date() }}
+    Time: {{ time }}
   </div>  
 </template>
 
-<style scoped>
-  div {
-    background-color: black;
-    border-radius: 5px;
-    color: white;
-    padding: 20px;
-  }
-</style>s
+<script>
+export default {
+  data() {
+    return {
+      time: new Date()
+    }
+  },
+}
+</script>
+
+<style src="./style.css" scoped />