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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<body>
<div class="w3-container">
  <h3>Mobile First Fluid Grid</h3>
  <p class="w3-large">Try to resize the window!</p>
</div>
<div class="w3-row">
  <div class="w3-col m1 w3-center w3-grey">1</div>
  <div class="w3-col m1 w3-center">2</div>
  <div class="w3-col m1 w3-center w3-grey">3</div>
  <div class="w3-col m1 w3-center">4</div>
  <div class="w3-col m1 w3-center w3-grey">5</div>
  <div class="w3-col m1 w3-center">6</div>
  <div class="w3-col m1 w3-center w3-grey">7</div>
  <div class="w3-col m1 w3-center">8</div>
  <div class="w3-col m1 w3-center w3-grey">9</div>
  <div class="w3-col m1 w3-center">10</div>
  <div class="w3-col m1 w3-center w3-grey">11</div>
  <div class="w3-col m1 w3-center">12</div>
</div>
<div class="w3-row">