FAQ: Changing the Box Model - The New Box Model


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

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This exercise can be found in the following Codecademy content:

Web Development

Learn CSS

FAQs on the exercise The New Box Model

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In what kind of context would it be better to use content-box model rather than a border-box model? If the border-box model makes calculating the layout easier, is there a reason why you wouldn’t always use only that one? Are there disadvantages to the border-box model?


where is the proper place to add the universal selector?


Do you have to declare the new box model at the beginning of your code or can you place in any location? In addition using the * can you set other universal defaults within CSS?


Can you please explain how you advance to the next screen in this particular Box Model Exercise. The first Instructions are to experiment changing the Height, Width, Padding, etc. and then the Next button never turns yellow to go to the next screen. How on earth do I advance please?


I have no idea what I’m doing wrong with this one. I cant’ see any difference between what I have done and the solution. I just copy and pasted the code from the instructions and it doesn’t work. Is there a glitch in this one?