CSS Animatable grid-auto-rows Property Example

<!DOCTYPE html>
<html>
<head>
<style> 
#grid-container {
    display: grid;
    grid-auto-rows: 150px;
    background: #333;
    grid-gap: 5px;
    padding: 5px;
	box-shadow: 0 0 10px 0 #aaa;
    animation: anim 5s infinite;
}
.item1 { grid-area: 1 / 1 / 2 / 2; }
.item2 { grid-area: 1 / 2 / 2 / 3; }
.item3 { grid-area: 1 / 3 / 2 / 4; }
.item4 { grid-area: 2 / 1 / 3 / 2; }
.item5 { grid-area: 2 / 2 / 3 / 3; }
.item6 { grid-area: 2 / 3 / 3 / 4; }
  
#grid-container div {
    text-align: center;
    padding: 20px 0;
    font-size: 20px;
    background: #97ff99;
}

@keyframes anim { 
    50% {grid-auto-rows: 100px}
}
</style>
</head>
<body>

<h1>Animatable 'grid-auto-rows' Property</h1>
<hr>
  
<p>Experience the changing size of rows from 150px to 100px.</p>

<div id="grid-container">
    <div class="item1">1</div>
    <div class="item2">2</div>
    <div class="item3">3</div>  
    <div class="item4">4</div>
    <div class="item5">5</div>
    <div class="item6">6</div>
</div>

</body>
</html>