<div class="container">
<div class="item"></div>
<div class="item aqua"></div>
<div class="item"></div>
</div>
.container {
position: relative;
flex-direction: column;
display: flex;
height: 90vh;
width: 90vw;
border: 3px solid black;
margin: auto;
}
.container::before, .container::after {
content: "";
flex: 1;
}
.item {
padding: 10vh;
width: 70vw;
background: teal;
margin: 0 auto;
}
.aqua {
background: aqua;
}
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