Making an element take 100% height and scrollable

<div class="parent">
  <div class="child-1"></div>
  <div class="child-2">
    <h1>Header</h1>
    <div class="list">
      <div class="item-1">{...}</div>
    </div>
  </div>
</div>
<style>
  .parent {
    max-height: min(100vh - 101px, 892px);
    overflow-y: auto;
  }

  .child-2 {
    display: flex;
    flex-direction: column;
  }

  .list {
    flex: 1;
    max-height: 100%;
    overflow-y: auto;
  }
</style>