<!DOCTYPE html>
<html>
<head>
<style>
.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 { display: grid;
grid-auto-columns: 50px;
grid-gap: 10px;
background-color: #2196F3;
padding: 10px;
animation: mymove 5s infinite;
}
.grid-container > div { background-color: rgba(255, 255, 255, 0.8);
text-align: center;
padding: 20px 0;
font-size: 30px;
}
@keyframes mymove { 50% {grid-auto-columns: 100px;}}
</style>
</head>
<body>
<h1>Animation of the grid-auto-columns Property</h1>
<p>The animation will change the size of the columns from 50px to 100px.</p>
<div class="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>