fix(custom): 修复若干样式污染的问题

src/components/Back.vue

@@ -5,7 +5,7 @@
       <view class="line"></view>
       <Home class="iconfont" @click="goHome" />
     </view>
-    <text class="title">{{ props.title }}</text>
+    <text style="width: 410px;text-align: center;">{{ props.title }}</text>
   </view>
 </template>
 
@@ -66,9 +66,4 @@ const goHome = () => {
     box-sizing: border-box;
   }
 }
-
-.title {
-  width: 410px;
-  text-align: center;
-}
 </style>