什么是 Well ?
Well 类似于微信聊天中的带个绿色气泡的文本信息
<div class = "well">Hi, am in well !!</div>
怎样 Well 的有几种尺寸?
除了普通尺寸,还有 well-lg 和 well-sm 两种尺寸
<div class = "well well-lg">Hi, am in large well !!</div>
<div class = "well well-sm">Hi, am in small well !!</div>
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