在div中设置一个div以滚动，而父div不滚动

I have a container div that holds many child divs. One of the divs in my container houses comments. Instead of setting the whole div to scroll, I want everything to stay in place, leaving only the comments div to scroll. I have tried setting the parent overflow to hidden, and the comment div to scroll, and the scrollbar actually shows on the page but it is disabled. Does anyone know how I can accomplish this?I have a container div that holds many child di