<div class="grid">
<div class="item"></div>
<div class="bg1"></div>
<div class="bg2"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item"></div>
</div>
body {
margin: 0;
background: beige;
}
.grid {
margin: 5%;
display: grid;
grid-template-columns: repeat(6, 100px);
grid-template-rows: repeat(6, 100px);
grid-gap: 15px;
position: relative;
background-color: gray;
z-index: -2;
justify-content: center;
}
.item {
background-color: blue;
}
.bg1 {
background: red;
position: absolute;
width: 100%;
height: 100%;
grid-row: 1 / 4;
grid-column: 1 / 4;
z-index: -1;
}
.bg2 {
background: yellow;
position: absolute;
width: 100%;
height: 100%;
grid-row: 2 / 4;
grid-column: 5 / -1;
z-index: -1;
}
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