Question about border length

Question about border length
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#1

Hello, im trying to find out how to make my bottom border of section a be smaller in length compared to section, i tried using margin’s and paddings but it changed size of whole section instead.


#2

Please be more specific on what the issue is. may be post a picture of the issue if its hard to explain


#3

Never mind, i checked out my previous tribute page and i found out the way it could work instead. I was talking about changing size i.e. length of a border of a box/container/section/header or what ever.