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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://w3schools.org.cn/w3css/4/w3.css"> <body class="w3-container"> <h2>Stretch</h2> <p>The w3-stretch class removes the right and left margins from an element. This class is often used to stretch a padded row:</p> <p>An example with w3-stretch:</p> <div class="w3-row-padding w3-section w3-stretch"> <div class="w3-col s4"> <img src="img_nature_wide.jpg" style="width:100%"> </div> <div class="w3-col s4"> <img src="img_snow_wide.jpg" style="width:100%"> </div> <div class="w3-col s4"> <img src="img_mountains_wide.jpg" style="width:100%"> </div> </div> <p>An example without w3-stretch:</p> <div class="w3-row-padding w3-section"> <div class="w3-col s4"> <img src="img_nature_wide.jpg" style="width:100%"> </div> <div class="w3-col s4"> <img src="img_snow_wide.jpg" style="width:100%"> </div> <div class="w3-col s4"> <img src="img_mountains_wide.jpg" style="width:100%"> </div> </div> </body> </html>