JSFiddle - React, Tailwind, and code Playground

HTML

<div id="test">
  <div id="block1">
    <div>test</div>
    <div>test</div>
    <div>test</div>
    <div>test</div>
    <div>test</div>
    <div>test</div>
    <div>test</div>
    <div>test</div>
    <div>test</div>
    <div>test</div>
  </div>
  <div id="block2">
    sample
  </div>
</div>

CSS

#test {
  background: yellow;
  display: flex;
  align-items: center;
}
#block1 {
  background-color: grey;
}
#block2 {
  background-color: green;
  margin-left: auto;
}