Bootstrap 缩略图
本章将讲解 Bootstrap 缩略图。大多数站点都需要在网格中布局图像、视频、文本等。Bootstrap 通过缩略图为此提供了一种简便的方式。使用 Bootstrap 创建缩略图的步骤如下：
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在图像周围添加带有 class .thumbnail 的 a 标签。
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这会添加四个像素的内边距（padding）和一个灰色的边框。
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当鼠标悬停在图像上时，会动画显示出图像的轮廓。
下面的实例演示了默认的缩略图：
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结果如下所示：
添加自定义的内容
现在我们有了一个基本的缩略图，我们可以向缩略图添加各种 HTML 内容，比如标题、段落或按钮。具体步骤如下：
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把带有 class .thumbnail 的 <a> 标签改为 <div>。
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在该 <div> 内，您可以添加任何您想要添加的东西。由于这是一个 <div>，我们可以使用默认的基于 span 的命名规则来调整大小。
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如果您想要给多个图像进行分组，请把它们放置在一个无序列表中，且每个列表项向左浮动。
下面的实例演示了这点：
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结果如下所示：
