04-use-css-grid-units-to-change-the-size-of-columns-and-rows.html

<style>
  .d1 { background: LightSkyBlue; }
  .d2 { background: LightSalmon; }
  .d3 { background: PaleTurquoise; }
  .d4 { background: LightPink; }
  .d5 { background: PaleGreen; }
  
  .container {
    font-size: 40px;
    width: 100%;
    background: LightGray;
    display: grid;
    grid-template-columns: 1fr 100px 2fr;
    grid-template-rows: 50px 50px;
  }
</style>

<div class="container">
  <div class="d1">1</div>
  <div class="d2">2</div>
  <div class="d3">3</div>
  <div class="d4">4</div>
  <div class="d5">5</div>
</div>