fix

@@ -2,7 +2,7 @@
   <div class="">
     <background></background>
     <mu-container>
-      <mu-form ref="form" :model="validateForm" class="mu-demo-form">
+      <mu-form ref="form" :model="validateForm" class="mu-demo-form1">
         <mu-form-item label="用户名" help-text="帮助文字" prop="username" :rules="usernameRules">
           <mu-text-field v-model="validateForm.username" prop="username"></mu-text-field>
         </mu-form-item>
@@ -74,7 +74,7 @@ export default {
   body {
     background: #1F2D3D;
   }
-.mu-demo-form {
+.mu-demo-form1 {
   padding: 20px;
   -webkit-border-radius: 5px;
   border-radius: 5px;