<!DOCTYPE html>
<html>
<head>
<style>
.grid-container {
display: grid;
grid-gap: 10px;
grid-template-columns: repeat(auto-fill, minmax(220px, auto));
background-color: blue;
padding: 10px;
}
.grid-container > div {
background-color: lightblue;
border: 1px solid;
padding: 15px;
}
</style>
</head>
<body>
<div class="grid-container">
<div class="grid-item1">a</div>
<div class="grid-item2">b</div>
<div class="grid-item3">c</div>
<div class="grid-item4">d</div>
<div class="grid-item5">e</div>
<div class="grid-item6">f</div>
</div>
</body>
</html>