css 瀑布流布局

.demand_card {
margin-top: 24rpx;
// flex-wrap: wrap;
display: grid;
grid-template-columns: repeat(3, 1fr);
grid-gap: 16px;

.demand_icon {width: 27rpx;height: 30rpx;
}

}
.demand_item {
box-sizing: border-box;
}