JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <link rel="stylesheet" type="text/css" href="style.css"> 
  <meta charset="UTF-8">
  <title></title>
</head>
<body>
  <div class="container">
    <div class="item" style="height: 100px;width:100%;background-color: red;"></div>
    <div class="item" style="height: 100px;width:100%;background-color: green;"></div>
    <div class="item" style="height: 100px;width:100%;background-color: blue;"></div>
  </div>
</body>
</html>

CSS

.container {
  display: flex;
  width: 100%;
  flex-wrap: wrap-reverse;
  flex-direction: row-reverse;
}

.item {
  flex: 1;
  flex-basis: 50%;
}

.item:nth-child(1) {
  order: 3;
}

.item:nth-child(2) {
  order: 2;
}

.item:nth-child(3) {
  order: 1;
}