SOURCE

<div class="container">
	<div class="item item--1">1</div>
	<div class="item item--2">2</div>
	<div class="item item--3">3</div>
	<div class="item item--4">4</div>
	<div class="item item--5">5</div>
	<div class="item item--6">6</div>
</div>

.container {
    background-color: #eee;
    width: 1000px;
    margin: 30px auto;
    
    display: grid;
    grid-template-rows: 150px 150px;
    grid-template-columns: 150px 150px 150px;
}

.item {
    padding: 20px;
    font-size: 30px;
    font-family: sans-serif;
    color: white;
}


/* &--1{
    background-color: orange;
    
} */