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In the last lesson, you learned how to modify the dimensions of boxes. In this lesson, you'll learn how to manipulate another box property: borders.

In a previous exercise, you typed the following unexplained snippet of code into your stylesheet:

* { border: 1px solid rgba(0, 0, 0, 0.3); }

In this lesson, you'll learn exactly what this code means and how it can be used to help support your learning of the box model.

Let's begin!

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