css box inside color code example

Example 1: how to make a box in html

<div style="width:500px;height:100px;border:1px solid #000;">This is a rectangle!</div>

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;