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The Complete Advanced Guide to CSS

Understanding Box Sizing

Understand how CSS box-sizing affects element dimensions by including padding and borders in size calculations. Learn to control this behavior with box-sizing properties for precise and consistent layout design. Apply these concepts effectively to your projects.

We'll cover the following...

In this lesson I will explain some fundamental concepts with respect to the CSS Box Model.

Consider the following markup:

HTML
<div class="box"></div>

Pretty simple.

Let’s say this .box was styled like so:

NAME_
CSS
.box {
  width: 200px;
  height: 200px;
  background-color: red;
}

What we have now is a red square. Easy enough

What if we decided we wanted a padding of 100px within this box, like this:

padding: 100px

Here’s what we ...