style: pin points center action to bottom

uniapp/src/packages/pages/points_center/points_center.vue

@@ -66,7 +66,7 @@
 </template>
 
 <script lang="ts" setup>
-import { computed, ref } from 'vue'
+import { ref } from 'vue'
 import { onShow } from '@dcloudio/uni-app'
 import { accountLog } from '@/api/user'
 import request from '@/utils/request'
@@ -172,11 +172,16 @@ $line: #e8ebef;
 
     &__scroll {
         height: calc(100vh - 96rpx);
+        padding-bottom: 124rpx;
         box-sizing: border-box;
     }
 
     &__bottom-button {
-        margin: 24rpx 38rpx 0;
+        position: fixed;
+        left: 38rpx;
+        right: 38rpx;
+        bottom: calc(20rpx + env(safe-area-inset-bottom));
+        z-index: 20;
         height: 80rpx;
         display: flex;
         align-items: center;