JSFiddle - React, Tailwind, and code Playground

HTML

<flex-container>
  <flex-item></flex-item>
  <flex-item></flex-item>
  <flex-item optional></flex-item>
</flex-container>

SCSS

flex-container {
  display: flex;
  justify-content: space-between;
  border: 1px solid gray;
}

flex-item {
  flex-basis: 20%;
  height: 100px;
  margin: 5px;
  background-color: red;
}

[optional] {
  visibility: hidden;
}