How to set child width equal to parent element width with css? -


my html is:

.parent   .child

and .parent width not determined value, .child width 100%, both child , parent has own border, @ last child element width less 2px parent's width,

how can set child width equal parent element width css?

make sure child element display: block; (many elements default) , don't set width it. block elements take horizontal space can default.


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