JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
  <div>
    grid item
    <br> minimum width = 200px
    <br> maximum width = 400px
  </div>
  <div>
    grid item
    <br> takes remaining space on the row
  </div>
</div>

CSS

#container {
  display: grid;
  grid-template-columns: 25% 1fr;
  grid-gap: 10px;
  padding: 10px;
  height: 100px;
  background-color: #8cffa0;
}

#container > div:first-child {
  min-width: 200px;
  max-width: 400px;
}

#container>div {
  background-color: #8ca0ff;
  padding: 5px;
}