fix: make style work again

Author: Barthelemy Ledoux

demo/assets/input.js

@@ -1,12 +1,11 @@
 new Vue({
   template: `
 <div>
-  <input v-model="value" type="checkbox" :name="cname">
+  <input v-model="value" type="checkbox">
   <h1 v-if="value">I am checked</h1>
 </div>`,
   data() {
     return {
-      cname: "myCheck",
       value: false
     };
   }

src/Preview.vue

@@ -85,9 +85,12 @@ export default {
       }
 
       data.components = this.components;
+      if (style) {
+        data._scopeId = `data-${this.scope}`;
+        addScopedStyle(style, this.scope);
+      }
 
       this.$options.components.VuePreview = data;
-      addScopedStyle(style, this.scope);
     }
   }
 };