CSS(Cascading Style Sheet)
Box Sizing:-
Box sizing has two values,
box-sizing: border-box;
width + padding + border = actual width of an element
height + padding + border = actual height of an element
on an element, padding and border are included in the width and height:
box-sizing: content-box;
width + padding + border = actual width of an element
height + padding + border = actual height of an element
on an element, padding, and border are not included in the width and height: