Answers for "content box css"

box sizing border box

*{
 box-sizing: border-box;
 }

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;

padding is make biger elment

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