content-box和border-box
refer to
http://www.w3school.com.cn/cssref/pr_box-sizing.asp
refer to
https://blog.csdn.net/qq_32862143/article/details/79393987
-
content-box
说明：在内容宽度和高度之外绘制内边距和边框 -
border-box
说明：在已设定的宽度和高度之内绘制设定元素的边框及内边距
refer to
http://www.w3school.com.cn/cssref/pr_box-sizing.asp
refer to
https://blog.csdn.net/qq_32862143/article/details/79393987
content-box
说明：在内容宽度和高度之外绘制内边距和边框
border-box
说明：在已设定的宽度和高度之内绘制设定元素的边框及内边距
