"CSS Box Model"
Bootstrap 4.1.1 Snippet by bipon68

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="scale">
Scale
</div>
<div class="content-box">
Content Box
</div>
<div class="border-box">
Border Box
</div>
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div {
width: 160px;
height: 80px;
padding: 20px;
border: 8px solid red;
background: yellow;
}
.content-box {
box-sizing: content-box;
border: 8px solid skyblue;
width: 160px;
padding: 20px;
/* Total width: 160px + (2 * 20px) + (2 * 8px) = 216px
Total height: 80px + (2 * 20px) + (2 * 8px) = 136px
Content box width: 160px
Content box height: 80px */
}
.border-box {
box-sizing: border-box;
border: 8px solid blue;
width: 160px;
padding: 20px;
/* Total width: 160px
Total height: 80px
Content box width: 160px - (2 * 20px) - (2 * 8px) = 104px
Content box height: 80px - (2 * 20px) - (2 * 8px) = 24px */
}
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