css和css3弹性盒模型实现元素宽度（高度）自适应

https://blog.csdn.net/qq_38912819/article/details/80596192?utm_medium=distribute.pc_aggpage_search_result.none-task-blog-2~aggregatepage~first_rank_ecpm_v1~rank_v31_ecpm-3-80596192.pc_agg_new_rank&utm_term=%E5%BC%B9%E6%80%A7%E7%9B%92%E9%AB%98%E5%BA%A6%E8%87%AA%E9%80%82%E5%BA%94&spm=1000.2123.3001.4430

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来源： https://www.cnblogs.com/wfy680/p/15746707.html