微信小程序中的小小的遮罩层

<view class=‘pop_wx_er‘>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view>ddddddddddddd</view>
    <view bindtap=‘click‘>试试</view>      
    <view class=‘rgb‘hidden="{{hiddenName}}">
        <view class=‘code_block‘>
    <image src=‘/assets/img/b8.png‘class=‘code_img‘bindtap=‘hidden‘></image>
        <text class=‘code_text‘>扫码进入商城</text>
    </view>

    </view>
</view>

.pop_wx_er{
   background-color: #35b4ed;
   top: 0; 
   width: 100%; 
   height:100%;
}
.pop_wx_er .rgb{
    position: fixed;
    z-index: 99;
    top:0;
    width: 100%;
    height: 100%;
    background:rgba(0, 0, 0, 0.5);
}
.pop_wx_er .rgb .code_block{
    width: 650rpx;
    height: 700rpx;
    border-radius: 16rpx;
    background-color: white;
    margin: 250rpx 50rpx;
    text-align: center;
}
.pop_wx_er .rgb .code_block .code_img{
    width: 500rpx;
    height: 500rpx;
    margin: 90rpx 75rpx 0 75rpx;
}
.pop_wx_er .rgb .code_block .code_text{
    font-size: 28rpx;  
    color: #666666;
}