greenPro/unpackage/dist/dev/mp-weixin/pages/API/intersection-observer/intersection-observer.wxss

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.scroll-view {
height: 400rpx;
background: #fff;
border: 1px solid #ccc;
box-sizing: border-box;
}
.scroll-area {
height: 1300rpx;
display: flex;
flex-direction: column;
align-items: center;
}
.notice {
margin-top: 150rpx;
margin: 150rpx 0 400rpx 0;
}
.ball {
width: 200rpx;
height: 200rpx;
background: #4cd964;
border-radius: 50%;
}