how to fit blocks to border css code example

Example 1: border-box css

#example1 {
  box-sizing: border-box;
}

Example 2: 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;