If border=5px, width=90px, height=90px then total height and length should be=90+90+5+5 na???

Answer 1

div {
border: 5px solid green;
width: 90px;
height: 90px;
}
For this code they have done: 90+5+5 fir total height and width
Whyyyyy😟

Answer 2

https://stackoverflow.com/questions/45599697/overlapping-boxes

Answer 3

Margin is missing and maybe border doesn't count.

Answer 4

Oh ...
Dont add width and height

xxx
xxx
xxx

has total height 3 not 6