<div class="wrapper">
<div>
1
</div>
<div>
2
</div>
<div>
3
</div>
<div>
4
</div>
<div>
5
</div>
<div>
6
</div>
</div>
.wrapper {
display: grid;
grid-template-columns: 100px 100px 100px;
grid-template-rows: 50px 50px;
grid-gap: 10px;
}
div {
font-size: 30px;
text-align: center;
background-color: yellow;
}