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<title>Bootstrap 示例</title>
<meta charset="utf-8">
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<div class="container-fluid mt-3">
<h1>自动布局列</h1>
<p>在 Bootstrap 5 中，有一种创建等宽列的简单方法：只需在指定数量的 col 元素上使用 <code>.col-size</code> 类。 Bootstrap 将识别有多少列，并且每列将获得相同的宽度。</p>
<p>两列：在所有屏幕上为 50% 宽度，超小屏幕除外（在宽度小于 <strong>576px</strong> 的屏幕上为 100% 宽度）</p>
<div class="container-fluid">
<div class="row">
<div class="col-sm bg-primary text-white p-3">1 of 2</div>
<div class="col-sm bg-dark text-white p-3">2 of 2</div>
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<p>四列：所有屏幕上的 25% 宽度，超小屏幕除外（宽度小于 <strong>576px</strong> 的屏幕上为 100% 宽度）</p>
<div class="container-fluid">
<div class="row">
<div class="col-sm bg-primary text-white p-3">1 of 4</div>
<div class="col-sm bg-dark text-white p-3">2 of 4</div>
<div class="col-sm bg-primary text-white p-3">3 of 4</div>
<div class="col-sm bg-dark text-white p-3">4 of 4</div>
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