JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
  <div class="red"> </div>
  <div class="yellow"> </div>
  <div class="blue"> </div>
</div>

CSS

.red {
  width: 50px;
  height: 50px;
  background-color: red;
  margin-right: 20px;
}

.yellow {
  width: 50px;
  height: 50px;
  background-color: yellow;
}

.blue {
  width: 50px;
  height: 50px;
  background-color: blue;
  justify-self: end;
}

.wrapper {
  display: flex;
  background-color: green;
  width: 100%;
}