Bootstrap 井
井
.well 类为元素添加了一个圆角边框，并使用灰色背景颜色和一些内边距
基本井
井的大小
小井
正常井
大井
通过添加 .well-sm 类（用于小井）或 .well-lg 类（用于大井）来更改井的大小。
默认情况下，井的大小为中等。
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