feat: login tips style format

uniapp/pages/index/index.vue

@@ -17,7 +17,7 @@
             <cate-two></cate-two>
         </view>
         <view v-else>
-            <u-empty mode="permission" margin-top="180" icon-size="600" text="请使用企业身份登录"
+            <u-empty mode="permission" icon-size="500" text="请使用企业身份登录"
                 src="/static/images/permission.png">
                 <router-link to="/pages/login/login" slot="bottom"
                     class="flex row-center user-login white m-t-16 p-t-16 p-b-16 p-l-50 p-r-50">

uniapp/pages/user/user.vue

@@ -64,7 +64,7 @@
             </view>
         </view>
         <view v-else>
-            <u-empty mode="permission" margin-top="180" icon-size="600" text="请使用企业身份登录"
+            <u-empty mode="permission" icon-size="500" text="请使用企业身份登录"
                 src="/static/images/permission.png">
                 <router-link to="/pages/login/login" slot="bottom"
                     class="flex row-center user-login white m-t-16 p-t-16 p-b-16 p-l-50 p-r-50">