There are 2 nested divs.
<div class="primer1"> <div class="primer2"> ... </div> </div> .primer1 { height: 100px; overflow-y:scroll; scrollbar-arrow-color:#000000; scrollbar-base-color: #228B22; } The content of primer2 is higher in height, it shows the upper part and we can move the slider down. And it is necessary that the bottom is initially displayed and we could move up.
Following the example of chats: we should see the latest messages, and if we need to look at earlier messages, we scroll up.
How can this be implemented?