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<!DOCTYPE html>
<html>
<style>
.grid {
    display: grid;
    grid-template-columns: repeat(4, 50px);
    grid-auto-flow: dense;
}
</style>
<body>
  <p>Ensure that dense-packing places multi-spanning item into highest eligible track opening. The yellow item should be placed in track opening.</p>
  <div class="grid">
    <div style="background: lightskyblue; height: 70px;" >
      1
    </div>
    <div style="background: lightblue; height: 20px; grid-column: 4;" >
      2
    </div>
    <div style="background: darkblue; height: 20px; grid-column: 3 / span 2; transform: translateY(-50px);">
      3
    </div>
    <div style="background: lightsteelblue; height: 20px; grid-column: span 4; transform: translateY(-20px);" >
      4
    </div>
    <div style="background: yellow; height: 10px; grid-column: span 2;" >
      5
    </div>
  </div>
</body>
</html>