JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="card" style="height: 100%;">
    <div class="card-header">Title</div>
    <div class="card-block">
      <div class="chart row" style="height: 100%"></div>
    </div>
  </div>
</div>

CSS

.container {
  width: 500px;
  height: 200px;
}
.card {
  display: flex;
  flex-direction: column;
}
.card-block {
  flex: 1;
}
.chart {
  background: red;
}