margin padding border code example

Example 1: css reset margin padding

* {
  margin: 0;
  padding: 0;
}

Example 2: how to make a box in html

This is a rectangle!

Example 3: how to style rule to apply the Border Box model css

header, ul, nav, li, a /* other elements */{

 display: block;
   -webkit-box-sizing: border-box;
   -moz-box-sizing: border-box;
   box-sizing: border-box;

Example 4: padding margin and border

GO TO THIS LINK
https://www.geeksforgeeks.org/css-margins-padding/
https://media.geeksforgeeks.org/wp-content/uploads/cssmarginandpadding.png

Example 5: css box model

MDN (Mozilla Developer Network)
Probably the best place for an in-depth explanation of
web related technologies.

See the link below regarding the CSS BOX MODEL