I use the standard box model.
I use the alternate box model.
.box { border: 5px solid rebeccapurple; background-color: lightgray; padding: 40px; margin: 40px; width: 300px; height: 150px; } .alternate { box-sizing: border-box; }
<div class="box">I use the standard box model.</div> <div class="box alternate">I use the alternate box model.</div>