Using CSS to set scrollbar Width

I am adding the following CSS style to set the scroll bar width in my DIV element. My question is in some part of the div tag of the same page, the width is adjusted but in other part, the div tag is wrong.

Can you please tell me if I do this, if that mean I am setting the scroll bar globally in my whole page. Is this correct?

::-webkit-scrollbar {
    width: 24px;
}