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css - HTML body is not at the top of the page even with margin set to 0 - Stack Overflow
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HTML and CSS Tutorial: The Basics
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html - Why isn't this CSS margin 0 applied? - Stack Overflow
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Margin vs Padding in CSS Explained - DEV Community
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Learn the CSS Box Model by Building a Rothko Painting - Step 21 - HTML-CSS - The freeCodeCamp Forum
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CSS margin vs. padding - LogRocket Blog
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HTML & CSS Tutorial: Margins and Padding! - YouTube
Make <body> Take Up 100% of the Browser Height | kirupa.com
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