CodePen Embed - NWxKgBp

<div class="item"></div>
<div class="item"></div>
<div class="item"></div>

body {
  display: flex;
  flex-wrap: wrap;
}

.item {
  margin: 10px 5px;
  width: calc(50% - 10px);
  height: 300px;
  background: #000;
}
@media (max-width: 900px) {
  .item {
    width: 100%;
  }
}

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