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Found one mistake in this section.
Around 5:05 in this course, Nick said that we're applying 5% padding to both sides of the element. This will be 5% of the total width of the wrapper element itself.
Actually, 5% should be the width of the body element instead of wrapper element itself. The percentage value is measured relative to a parent element's length. In this case, the parent element of wrapper is body.
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