JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
  <div class="item"></div>
  <div class="item item-bottom"></div>
  <div class="item"></div>
</div>

CSS

.wrapper  {
  width: 200px;
  height: 200px;
  border: 1px solid #000;
  display: flex;
  align-items: center;
}
.item {
  width: 50px;
  height: 50px;
  border: 1px solid red;
}
.item-bottom {
  align-self: flex-end;
}