http://jsbin.com/razeyehama/e.
< hr > 1. Purpose: when the top of the green category scrolls to the red bottom, it will not follow the scroll.
2, question: not only is the structure written wrong or the CSS is mislocated, now use position:sticky (IOS and PC chrome) do not achieve the above purpose
3, ask the gods to help me analyze what the reason is, you can directly change the