(PCC)::[How-to-use-Padding-and-element-width-(with-box-sizing)]::[css]
<!DOCTYPE html>
<html>
<head>
<style>
div.ex1 {
width: 300px;
background-color: yellow;
}
div.ex2 {
width: 300px;
padding: 25px;
box-sizing: border-box;
background-color: lightblue;
}
</style>
</head>
<body>
<h2>Padding and element width - with box-sizing</h2>
<div class="ex1">This div is 300px wide.</div>
<br>
<div class="ex2">The width of this div remains at 300px, in spite of the 50px of total left and right padding, because of the box-sizing: border-box property.
</div>
</body>
</html>