bug fixes

src/modules/cert/views/Index.vue

 <template>
   <app-container>
-    <el-empty :description="msg" v-if="expirationMonth === 12 && !data.length"></el-empty>
-    <div v-if="expirationMonth === 3 && !data.length" style="position: relative">
+    <el-empty :description="msg" v-if="!data.length"></el-empty>
+    <div v-if="expirationMonth === 3 && msg" style="position: relative">
       <el-empty description="您已考试通过，请扫描下方二维码获取证书"></el-empty>
-      <img
-        src="https://webapp-pub.ezijing.com/project/fd/u171.png"
-        alt=""
-        style="position: absolute; top: 350px; left: 50%; transform: translate(-50%, -50%); width: 200px; height: 200px"
-      />
+      <img src="https://webapp-pub.ezijing.com/project/fd/u171.png" alt="" class="img_exam" style="" />
     </div>
     <div class="cert" v-if="data.length">
       <div class="home-box-content" :key="index" alt="" v-for="(item, index) in data">
@@ -69,4 +65,12 @@ export default {
     margin-top: 20px;
   }
 }
+.img_exam {
+  position: absolute;
+  top: 350px;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  width: 200px;
+  height: 200px;
+}
 </style>