JSFiddle - React, Tailwind, and code Playground

HTML

<div class="a">
  <dic class="b">
    <div class="c"></div>
  </dic>
</div>

CSS

.a {
 /*  display: flex;
  flex-direction: column; */
  border: 1px solid green;
  height:600px;
}

.c {
  border: 1px solid red;
  height:90%;
  width: 100%;
}