div with item 2 here will expand the row height to be greater than 1fr:
<div class="container">
<div>1</div>
<div>2 what happens to me when i'm too big? It's not fair to others</div>
<div>3</div>
<div>4</div>
</div>
.container {
display: grid;
grid-template-columns: 1fr 1fr;
grid-template-rows: 1fr 1fr;
width: 200px;
height: 100px;
outline: 1px solid red;
}
.container > * { outline: 1px solid green;}