clarification for CSS Border Property

Question

I need more clarification about the CSS Border Property. let say, thus the Border-top-width, Border-bottom-width, Border-right-width and the Border-left-width will not work unless the Border Style is not set?

Answer 1

you need to add border style : solid... visit www.css-tricks.com for more info

Answer 2

https://www.w3schools.com/css/css_border.asp

I hope this provides more clarification and new concepts