create border box css code example
Example 1: how do i make a boxin html
<div style="width:500px;height:100px;border:1px solid #000;">This is a rectangle!</div>
Example 2: border-box css
#example1 {
box-sizing: border-box;
}
Example 3: padding margin and border
GO TO THIS LINK
https://www.geeksforgeeks.org/css-margins-padding/
https://media.geeksforgeeks.org/wp-content/uploads/cssmarginandpadding.png