<div class="container">
<div class="item"></div>
</div>
.container {
display: grid;
height: 90vh;
width: 90vw;
grid-template-rows: repeat(3, 1fr);
border: 3px solid black;
margin: auto;
}
.container::before, .container::after {
content: "";
}
.item {
background: teal;
width: 60vw;
margin: 0 auto;
}
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