HTML & CSS · The Box Model · Lesson 7 of 25
Understanding the Box Model
Concept
Understanding the Box Model
Every element is a box made of content, padding, border, and margin, counted from the inside out.
Padding adds space inside the border (and gets the element's background color), while margin adds space outside the border and is always transparent.
- Explain the core idea behind Understanding the Box Model.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Understanding the Box Model. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Create a box with 20px padding, a 2px border, and 10px margin.
Ask about this lesson or your next move. The guide explains the path without taking the work away from you.
Ready for the next lesson?
Mark this lesson complete when you have finished the exercise.
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