before I add border:solid, it is shown below, and the background color of the top part is not available
border:solid
d.png](/img/bV87wK)
:
before I add border:solid, it is shown below, and the background color of the top part is not available
border:solid
d.png](/img/bV87wK)
:
border prevents margin-top from collapsing.
to observe this phenomenon, you can replace border with outline.
to avoid margin-top problems, you can replace the container padding-top or change the container's overflow attribute.
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