CSS child height 100% with parent padding

I've gone through a lot of similarly named questions, but have not been able to find an answer.

When a parent div has a padding and I create a child div, width 100% follows the content-box size of the parent, but height 100% seems to take the border box value of the parent. So for instance a parent with height 100px and 5px padding would create a child of height 100% with the height 100px instead of 90px.

Can anyone help me achieve the height of the parents content-box with padding?

I want to achieve a nice horizontal border, that is clipped in both ends, but is still centered.

Thank you for all and any help!

Alari

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