Solve the Problem of div content overflow (parent div height cannot be scaled)

This problem often occurs in the past. I forgot it next time, So I recorded that the div content overflows (the parent div height cannot be scaled), for example: in fact, this is a simple answer, as long as you add the clear floating in the parent div: & amp; lt

This problem often occurs in the past. I forgot it next time, So I recorded that the div content overflows (the parent div height cannot be scaled), for example:

In fact, this is a simple answer, as long as you add a clear floating in the parent div:

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