is padding included in width border-box code example
Example 1: border-box css
#example1 {
box-sizing: border-box;
}
Example 2: stop padding from changing div size
-webkit-box-sizing: border-box; /* Safari/Chrome, other WebKit */
-moz-box-sizing: border-box; /* Firefox, other Gecko */
box-sizing: border-box; /* Opera/IE 8+ */