CSS: How to position two elements on top of each other, without specifying a height?

Question

Actually this is possible without position absolute and specifying any height. All You need to do, is use display: grid on parent element and put descendants, into the same row and column.

Please check example below, based on Your HTML. I added only <span> and some colors, so You can see the result.

You can also easily change z-index each of descendant elements, to manipulate its visibility (which one should be on top).

.container_row{
  display: grid;
}

.layer1, .layer2{
  grid-column: 1;
  grid-row: 1;
}

.layer1 span{
  color: #fff;
  background: #000cf6;
}

.layer2{
  background: rgba(255, 0, 0, 0.4);
}

<div class="container_row">
    <div class="layer1">
        <span>Lorem ipsum...<br>Test test</span>
    </div>
    <div class="layer2">
        More lorem ipsum...
    </div>
</div>
<div class="container_row">
    ...same HTML as above. This one should never overlap the .container_row above.
</div>

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