TL/DR:
How to make an element look like it's "below" the border, but "above" the border's content, when the border has rounded corners?How to make an element look like it's
阅读背景：
如何使一个元素看起来像是在边框“下方”，但是当边框有圆角时，边框的内容“在”上方？
来源：互联网
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