diff --git a/src/questions/css-questions.md b/src/questions/css-questions.md
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 * Can you explain the difference between px, em and rem as they relate to font sizing?
 * Can you give an example of a pseudo class? Can you provide an example use case for a pseudo class? 
 * What is the difference between a block level element and an inline element. Can you provide examples of each type of element?
-* What is the difference between CSS Grid and Flexbox? When would you use one over the other?
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+* What is the difference between CSS Grid and Flexbox? When would you use one over the other?
+* What's the difference between fixed, fluid and responsive layouts?