<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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