fix: layout无背景色、swiper 分页器不居中 (#2371)

Author: oasis-cloud

packages/nutui-taro-demo-rn/src/base/pages/cell/index.config.ts

@@ -1,3 +1,3 @@
 export default {
   navigationBarTitleText: 'Cell',
-}
+}

src/packages/indicator/indicator.harmony.css

@@ -4,6 +4,7 @@
   width: auto;
   flex-wrap: nowrap;
   align-items: center;
+  justify-content: center;
 }
 .nut-indicator-dot {
   display: inline-block;

src/packages/indicator/indicator.scss

@@ -4,6 +4,7 @@
   width: auto;
   flex-wrap: nowrap;
   align-items: center;
+  justify-content: center;
 
   &-dot {
     display: inline-block;

src/packages/layout/demos/taro/demo2.tsx

@@ -1,6 +1,7 @@
 import React from 'react'
 import { Col, Row } from '@nutui/nutui-react-taro'
 import { View } from '@tarojs/components'
+import '../../demo.scss'
 
 const Demo2 = () => {
   return (

src/packages/layout/demos/taro/demo3.tsx

@@ -1,6 +1,7 @@
 import React from 'react'
 import { Col, Row } from '@nutui/nutui-react-taro'
 import { View } from '@tarojs/components'
+import '../../demo.scss'
 
 const Demo3 = () => {
   return (