JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container-fluid">
  <div class="panel-container">
    <div class="panel">1 of 4</div>
    <div class="panel">2 of 4</div>
    <div class="panel">3 of 4</div>
  </div>
</div>

CSS

.panel-container {
  display: flex;
  justify-content: flex-end;
}

.panel {
  flex: 0 0 300px;
  border: solid 1px #6c757d;
  padding: 10px;
}