Css box

How do i make a boxin html

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

Border-box css

#example1 {
  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;

Css box

html {
  box-sizing: border-box;
}
*, *:before, *:after {
  box-sizing: inherit;
}

Source: css-tricks.com

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