<!DOCTYPE html>
<html>
<head>
<title>CSS Grid Layout</title>
<style>
.grid-container {
display: grid;
grid-template-columns: auto auto auto;
padding: 10px;
}
.grid-container > div {
background-color: #a6e9f5;
text-align: center;
padding: 20px 0;
font-size: 30px;
border: 1px solid black;
}
.item1 { grid-area: 1 / 3 / 2 / 4; }
.item2 { grid-area: 2 / 3 / 3 / 4; }
.item3 { grid-area: 1 / 1 / 2 / 2; }
.item4 { grid-area: 1 / 2 / 2 / 3; }
.item5 { grid-area: 2 / 1 / 3 / 2; }
.item6 { grid-area: 2 / 2 / 3 / 3; }
</style>
</head>
<body>
<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>
</body>
</html>