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为什么::before 的height高度不起怎用了?

我的布局是flex布局,使用了一个div的::before来做左右窗格调整大小的间隔线,我的间隔div的宽度与高度是对的。但是他的before元素的高度就不对,设置固定高度也不起作用。请问是哪里出了问题?
image.png
黄度的是间隔div,中间那一段短的绿线是::before元素
image.png
间隔div的CSS

image.png
::before的css

请问哪里出了问题?谢谢


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块元素,宽高不生效
加个display:inline-block;


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