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<!DOCTYPE html>
<html>
<head>
    <title>W3.CSS(w3cschool.cn)</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
    <link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
</head>
<body>
<div class="w3-container">
    <h3>w3-row 和 w3-row-padding之间的区别</h3>
    <p>w3-row类定义了一个无填充的容器：</p>
</div>
<h2>拉伸</h2>
<p>w3-stretch类可删除元素的左右边界。此类通常用于拉伸填充行：</p>
<p>w3-stretch的示例：</p>
<div class="w3-row-padding w3-section w3-stretch">
    <div class="w3-col s4">
        <img src="https://atts.w3cschool.cn/img_nature_wide.jpg" style="width:100%">
    </div>
    <div class="w3-col s4">
        <img src="https://atts.w3cschool.cn/img_snow_wide.jpg" style="width:100%">
    </div>
    <div class="w3-col s4">
        <img src="https://atts.w3cschool.cn/img_mountains_wide.jpg" style="width:100%">
    </div>
</div>
<p>没有w3-stretch的示例：</p>
<div class="w3-row-padding w3-section">
    <div class="w3-col s4">
 
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