JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div>This div should be vertically centered</div>
    <div>This one too</div>
    <div>And this div shoud be placed at the bottom of the flex container</div>
</div>

CSS

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}
.container div {
  margin: 5px;
  padding: 5px 10px;
  border: 1px solid;
}