# FAQ: Changing the Box Model - Box Model: Content-Box

This community-built FAQ covers the “Box Model: Content-Box” exercise from the lesson “Changing the Box Model”.

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This exercise can be found in the following Codecademy content:

## FAQs on the exercise Box Model: Content-Box

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Is the margin initialized to 0 in the default box content?

I’m not really sure about this. In the diagram, Shouldn’t left and right border be included in length of actual rendered width?
I’m talking about the line that indicate length of actual rendered width.

What are the margin values of the content-box?

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Shouldn’t the actual rendered width in the example be 240 px. Currently:

width = 198 px
left and right padding = 20px
left and right border = 1px

If the actual rendered with is the sum of the padding, border and actual width, does that not mean the actual rendered width is 240 px rather than 200 px as shown in the example?

You have to look really closely to see the width is 158, not 198.
1 + 20 + 158 + 20 + 1 = 200.

Why is only the left and right padding accounted for?