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<!DOCTYPE html>
<html>
<head>
<style>
.grid-container {
  display: grid;
  grid-template-columns: auto auto auto;
  grid-template-rows: auto auto;
  grid-gap: 10px;
  background-color: #2196F3;
  padding: 10px;
}
.grid-container > div {
  background-color: rgba(255, 255, 255, 0.8);
  text-align: center;
  padding: 20px 0;
  font-size: 30px;
}
</style>
</head>
<body>
<h1>The grid-auto-flow Property</h1>
<p>The <em>grid-auto-flow</em> property controls how auto-placed items are inserted in the grid.</p>
<p>This grid has three columns and two rows.</p>
<h2>grid-auto-flow: column</h2>
<p>Insert items column by column:</p>
<div class="grid-container" style="grid-auto-flow: column;">
  <div class="item1">1</div>
  <div class="item2">2</div>
  <div class="item3">3</div>
  <div class="item4">4</div>
</div>
<h2>grid-auto-flow: row</h2>
<p>Insert items row by row:</p>
<div class="grid-container" style="grid-auto-flow: row;">