JSFiddle - React, Tailwind, and code Playground

HTML

<div id="list">
    <div class="item">1</div>
    <div class="item">2</div>
    <div class="item">3</div>
    <div class="item">4</div>
    <div class="item">5</div>
    <div class="item">6</div>
    <div class="item">7</div>
    <div class="item">8</div>
    <div class="item">9</div>
  </div>

CSS

#list {
  display: flex;
  flex-direction: column-reverse;
  height: 250px;
  overflow-y: scroll;
  border: 1px solid black;
}

.item {
  flex: 1;
  padding: 2em;
  border: 1px dashed green;
}