Fixed top
<view class="page__hd" style="position:fixed; top:0;width: 750rpx;"> </view>
Lower attached
<view class="page__hd" style="position:fixed; bottom:0;width: 750rpx;"> </view>
Fixed top
<view class="page__hd" style="position:fixed; top:0;width: 750rpx;"> </view>
Lower attached
<view class="page__hd" style="position:fixed; bottom:0;width: 750rpx;"> </view>