<!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">
<h2>Three Unequal Columns</h2>
<p>Three various-width columns (25%/50%/25%) on tablets, laptops and desktops. On mobile phones, the columns will automatically stack (100% width).</p>
<p>Try to resize the browser window to see the effect.</p>
</div>
<div class="w3-row">
<div class="w3-col m3 w3-green w3-center">
<p>m3</p>
</div>
<div class="w3-col m6 w3-dark-grey w3-center">
<p>m6</p>
</div>
<div class="w3-col m3 w3-red w3-center">
<p>m3</p>
</div>
</div>
<div class="w3-row w3-container">
<p>Inside a container:</p>
<div class="w3-col m3 w3-green w3-center">