JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
  <div class="item big"></div>
  <div class="item mid"></div>
  <div class="item mid "></div>
  <div class="item small"></div>
  <div class="item small"></div>
  <div class="item small"></div>
</div>

CSS

* {
  box-sizing: border-box;
}
.wrapper {
  max-width: 500px;
  width: 100%;
  border: 1px solid #000;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.item {
  background-color: blue;
  height: 150px;
  margin-bottom: 25px;
}
.big {
  width: 100%;
}
.mid {
  width: 45%;
}
.small {
  width: 30%;
}