JSFiddle - React, Tailwind, and code Playground

by habla

HTML

<div class="container">
  <select class="selector">
    <option>Your Option</option>
  </select>
  <button class="button">
    Hello
  </button>
</div>

CSS

.container {
  width: 100%;
  flex-wrap: wrap;
  background-color:red;
}

.selector {
  flex: 1 1 100;
}

.button {
  flex: 1 1 100;
  width: 100px;
}